Yoga (//; Sanskrit, योगः, pronunciation) is a group of physical, mental, and spiritual practices or disciplines which originated in ancient India. There is a broad variety of yoga schools, practices, and goals in Hinduism, Buddhism, and Jainism. Among the most well-known types of yoga are Hatha yoga and Rāja yoga.
The origins of yoga have been speculated to date back to pre-Vedic Indian traditions; it is mentioned in the Rigveda,[note 1] but most likely developed around the sixth and fifth centuries BCE, in ancient India's ascetic and śramaṇa movements.[note 2] The chronology of earliest texts describing yoga-practices is unclear, varyingly credited to Hindu Upanishads. The Yoga Sutras of Patanjali date from the first half of the 1st millennium CE, but only gained prominence in the West in the 20th century. Hatha yoga texts emerged around the 11th century with origins in tantra.
Yoga gurus from India later introduced yoga to the West, following the success of Swami Vivekananda in the late 19th and early 20th century. In the 1980s, yoga became popular as a system of physical exercise across the Western world. Yoga in Indian traditions, however, is more than physical exercise; it has a meditative and spiritual core. One of the six major orthodox schools of Hinduism is also called Yoga, which has its own epistemology and metaphysics, and is closely related to Hindu Samkhya philosophy.
Many studies have tried to determine the effectiveness of yoga as a complementary intervention for cancer, schizophrenia, asthma, and heart disease. The results of these studies have been mixed and inconclusive. On December 1, 2016, yoga was listed by UNESCO as an Intangible cultural heritage.
In Sanskrit, the word yoga comes from the root yuj which means "to add", "to join", "to unite", or "to attach" in its most common senses; as such. By figurative extension from the yoking or harnessing of oxen or horses (cf. English yoke and Latin iugum/jugum), the word took on broader meanings such as "employment, use, application, performance" (compare the figurative uses of "to harness" as in "to put something to some use"). All further developments of the sense of this word are post-Vedic. More prosaic moods such as "exertion", "endeavour", "zeal", and "diligence" are also found in Indian epic poetry.
There are very many compound words containing yoga in Sanskrit. Yoga can take on meanings such as "connection", "contact", "union", "method", "application", "addition" and "performance". In simpler words, Yoga also means "combined". For example, guṇáyoga means "contact with a cord"; chakráyoga has a medical sense of "applying a splint or similar instrument by means of pulleys (in case of dislocation of the thigh)"; chandráyoga has the astronomical sense of "conjunction of the moon with a constellation"; puṃyoga is a grammatical term expressing "connection or relation with a man", etc. Thus, bhaktiyoga means "devoted attachment" in the monotheistic Bhakti movement. The term kriyāyoga has a grammatical sense, meaning "connection with a verb". But the same compound is also given a technical meaning in the Yoga Sutras (2.1), designating the "practical" aspects of the philosophy, i.e. the "union with the supreme" due to performance of duties in everyday life
According to Pāṇini, a 6th-century BCE Sanskrit grammarian, the term yoga can be derived from either of two roots, yujir yoga (to yoke) or yuj samādhau (to concentrate). In the context of the Yoga Sutras of Patanjali, the root yuj samādhau (to concentrate) is considered by traditional commentators as the correct etymology. In accordance with Pāṇini, Vyasa who wrote the first commentary on the Yoga Sutras, states that yoga means samādhi (concentration).
According to Dasgupta, the term yoga can be derived from either of two roots, yujir yoga (to yoke) or yuj samādhau (to concentrate). Someone who practices yoga or follows the yoga philosophy with a high level of commitment is called a yogi (may be applied to a man or a woman) or yogini (traditionally denoting a woman).
The term yoga has been defined in various ways in the many different Indian philosophical and religious traditions.
|Source Text||Definition of Yoga|
|Katha Upanishad||"When the five senses, along with the mind, remain still and the intellect is not active, that is known as the highest state. They consider yoga to be firm restraint of the senses. Then one becomes un-distracted for yoga is the arising and the passing away" (6.10-11)|
|Bhagavad Gita||"Yoga is said to be equanimity" (2.48); "Yoga is skill in action" (2.50); "Know that which is called yoga to be separation from contact with suffering" (6.23).|
|Yogacarabhumi - Sravakabhumi||"Yoga is fourfold: faith, aspiration, perseverance and means" (2.152)|
|Yoga Sutras of Patanjali||"Yoga is the suppression of the activities of the mind" (1.2)|
|Vaisesika sutra||"Pleasure and suffering arise as a result of the drawing together of the sense organs, the mind and objects. When that does not happen because the mind is in the self, there is no pleasure or suffering for one who is embodied. That is yoga" (5.2.15-16)|
|Kaundinya's Pancarthabhasya on the Pasupatasutra||"In this system, yoga is the union of the self and the Lord" (I.I.43)|
|Linga Purana||"By the word 'yoga' is meant nirvana, the condition of Siva." (I.8.5a)|
|Brahmasutra-bhasya of Adi Shankara||"It is said in the treatises on yoga: 'Yoga is the means of perceiving reality." (2.1.3)|
|Yogabija||"The union of apana and prana, one's own rajas and semen, the sun and moon, the individual soul and the supreme soul, and in the same way the union of all dualities, is called yoga. " (89)|
The ultimate goal of Yoga is moksha (liberation), although the exact definition of what form this takes depends on the philosophical or theological system with which it is conjugated.
According to Jacobsen, "Yoga has five principal meanings:
According to David Gordon White, from the 5th century CE onward, the core principles of "yoga" were more or less in place, and variations of these principles developed in various forms over time:
White clarifies that the last principle relates to legendary goals of "yogi practice", different from practical goals of "yoga practice," as they are viewed in South Asian thought and practice since the beginning of the Common Era, in the various Hindu, Buddhist, and Jain philosophical schools.
The so-called Raja Yoga refers to Ashtanga Yoga, the eight limbs to be practiced to attain samadhi, as described in the Yoga Sutras of Pantajali. The term raja yoga originally referred to the ultimate goal of yoga, which is usually samadhi, but was popularised by Vivekananda as the common name for Ashtanga Yoga.
Due to the influence of Vivekananda, the Yoga Sutras of Patanjali are nowadays considered as the foundational scripture of classical yoga, a status which it only acquired in the 20th century. Before the twentieth century, other works were considered as the most central works, such as the Bhagavad Gita and the Yoga Vasistha, while Tantric Yoga and Hatha Yoga prevailed over Ashtanga Yoga.
Yoga as described in the Yoga Sutras of Patanjali refers to Ashtanga yoga. The Yoga Sutras of Patanjali is considered as a central text of the Yoga school of Hindu philosophy, It is often called "Rāja yoga", "yoga of the kings," a term which originally referred to the ultimate, royal goal of yoga, which is usually samadhi, but was popularised by Vivekananda as the common name for Ashtanga Yoga.
Ashtanga yoga incorporates epistemology, metaphysics, ethical practices, systematic exercises and self-development techniques for body, mind and spirit. Its epistemology (pramanas) is same as the Samkhya school. Both accept three reliable means to knowledge – perception (pratyākṣa, direct sensory observations), inference (anumāna) and testimony of trustworthy experts (sabda, agama). Both these orthodox schools are also strongly dualistic. Unlike the Sāṃkhya school of Hinduism, which pursues a non-theistic/atheistic rationalist approach, the Yoga school of Hinduism accepts the concept of a "personal, yet essentially inactive, deity" or "personal god". Along with its epistemology and metaphysical foundations, the Yoga school of Hindu philosophy incorporates ethical precepts (yamas and niyamas) and an introspective way of life focused on perfecting one's self physically, mentally and spiritually, with the ultimate goal being kaivalya (liberated, unified, content state of existence).
Many scholars also include the preceding Goraksha Samhita authored by Gorakshanath of the 11th century in the above list. Gorakshanath is widely considered to have been responsible for popularizing hatha yoga as we know it today.
Core techniques have been preserved in ancient Buddhist texts and have proliferated and diversified through teacher-student transmissions. Buddhists pursue meditation as part of the path toward Enlightenment and Nirvana.[note 3] The closest words for meditation in the classical languages of Buddhism are bhāvanā[note 4] and jhāna/dhyāna.[note 5]
Jain meditation has been the central practice of spirituality in Jainism along with the Three Jewels. Meditation in Jainism aims at realizing the self, attain salvation, take the soul to complete freedom. It aims to reach and to remain in the pure state of soul which is believed to be pure conscious, beyond any attachment or aversion. The practitioner strives to be just a knower-seer (Gyata-Drashta). Jain meditation can be broadly categorized to the auspicious Dharmya Dhyana and Shukla Dhyana and inauspicious Artta and Raudra Dhyana.
Samuel states that Tantrism is a contested concept. Tantra yoga may be described, according to Samuel, as practices in 9th to 10th century Buddhist and Hindu (Saiva, Shakti) texts, which included yogic practices with elaborate deity visualizations using geometrical arrays and drawings (mandala), fierce male and particularly female deities, transgressive life stage related rituals, extensive use of chakras and mantras, and sexual techniques, all aimed to help one's health, long life and liberation.
The origins of yoga are a matter of debate. There is no consensus on its chronology or specific origin other than that yoga developed in ancient India. Suggested origins are the Indus Valley Civilization (3300–1900 BCE) and pre-Vedic Eastern states of India, the Vedic period (1500–500 BCE), and the śramaṇa movement. According to Gavin Flood, continuities may exist between those various traditions:
[T]his dichotomization is too simplistic, for continuities can undoubtedly be found between renunciation and vedic Brahmanism, while elements from non-Brahmanical, Sramana traditions also played an important part in the formation of the renunciate ideal.[note 6]
Pre-philosophical speculations of yoga begin to emerge in the texts of c. 500–200 BCE. Between 200 BCE–500 CE philosophical schools of Hinduism, Buddhism and Jainism were taking form and a coherent philosophical system of yoga began to emerge. The Middle Ages saw the development of many satellite traditions of yoga. Yoga came to the attention of an educated western public in the mid 19th century along with other topics of Indian philosophy.
Yoga may have pre-Vedic elements. Some state yoga originated in the Indus Valley Civilization. Marshall, Eliade and other scholars suggest that the Pashupati seal discovered in Indus Valley Civilization sites depict figures in positions resembling a common yoga or meditation pose. This interpretation is considered speculative and uncertain by more recent analysis of Srinivasan and may be a case of projecting "later practices into archeological findings".
According to Crangle, some researchers have favoured a linear theory, which attempts "to interpret the origin and early development of Indian contemplative practices as a sequential growth from an Aryan genesis",[note 7] just like traditional Hinduism regards the Vedas to be the ultimate source of all spiritual knowledge.[note 8] Thomas McEvilley favors a composite model where pre-Aryan yoga prototype existed in the pre-Vedic period and its refinement began in the Vedic period.
Ascetic practices, concentration and bodily postures described in the Vedas may have been precursors to yoga. According to Geoffrey Samuel, "Our best evidence to date suggests that [yogic] practices developed in the same ascetic circles as the early sramana movements (Buddhists, Jainas and Ajivikas), probably in around the sixth and fifth centuries BCE."
According to Zimmer, Yoga philosophy is reckoned to be part of the non-Vedic system, which also includes the Samkhya school of Hindu philosophy, Jainism and Buddhism: "[Jainism] does not derive from Brahman-Aryan sources, but reflects the cosmology and anthropology of a much older pre-Aryan upper class of northeastern India [Bihar] – being rooted in the same subsoil of archaic metaphysical speculation as Yoga, Sankhya, and Buddhism, the other non-Vedic Indian systems."[note 9]
The first use of the root of word "yoga" is in hymn 5.81.1 of the Rig Veda, a dedication to rising Sun-god in the morning (Savitri), where it has been interpreted as "yoke" or "yogically control".[note 10]
The Yogis of Vedic times left little evidence of their existence, practices and achievements. And such evidence as has survived in the Vedas is scanty and indirect. Nevertheless, the existence of accomplished Yogis in Vedic times cannot be doubted.— Karel Werner, Yoga and the Ṛg Veda
Rigveda, however, does not describe yoga and there is little evidence as to what the practices were. Early references to practices that later became part of yoga, are made in Brihadaranyaka Upanishad, the earliest Hindu Upanishad.[note 11] For example, the practice of pranayama (consciously regulating breath) is mentioned in hymn 1.5.23 of Brihadaranyaka Upanishad (c. 900 BCE), and the practice of pratyahara (concentrating all of one's senses on self) is mentioned in hymn 8.15 of Chandogya Upanishad (c. 800–700 BCE).[note 12]
Ascetic practices (tapas), concentration and bodily postures used by Vedic priests to conduct yajna (sacrifice), might have been precursors to yoga.[note 13] Vratya, a group of ascetics mentioned in the Atharvaveda, emphasized on bodily postures which may have evolved into yogic asanas. Early Samhitas also contain references to other group ascetics such as munis, the keśin, and vratyas. Techniques for controlling breath and vital energies are mentioned in the Brahmanas (texts of the Vedic corpus, c. 1000–800 BCE) and the Atharvaveda. Nasadiya Sukta of the Rig Veda suggests the presence of an early contemplative tradition.[note 14]
The first known appearance of the word "yoga", with the same meaning as the modern term, is in the Katha Upanishad, probably composed between the fifth and third century BCE, where it is defined as the steady control of the senses, which along with cessation of mental activity, leading to a supreme state.[note 16] Katha Upanishad integrates the monism of early Upanishads with concepts of samkhya and yoga. It defines various levels of existence according to their proximity to the innermost being Ātman. Yoga is therefore seen as a process of interiorization or ascent of consciousness. It is the earliest literary work that highlights the fundamentals of yoga. White states:
The earliest extant systematic account of yoga and a bridge from the earlier Vedic uses of the term is found in the Hindu Katha Upanisad (Ku), a scripture dating from about the third century BCE[…] [I]t describes the hierarchy of mind-body constituents—the senses, mind, intellect, etc.—that comprise the foundational categories of Sāmkhya philosophy, whose metaphysical system grounds the yoga of the Yogasutras, Bhagavad Gita, and other texts and schools (Ku3.10–11; 6.7–8).
The hymns in Book 2 of the Shvetashvatara Upanishad, another late first millennium BCE text, states a procedure in which the body is held in upright posture, the breath is restrained and mind is meditatively focussed, preferably inside a cave or a place that is simple, plain, of silence or gently flowing water, with no noises nor harsh winds.
The Maitrayaniya Upanishad, likely composed in a later century than Katha and Shvetashvatara Upanishads but before Patanjali's Yoga Sutra, mentions sixfold yoga method – breath control (pranayama), introspective withdrawal of senses (pratyahara), meditation (dhyana), mind concentration (dharana), philosophical inquiry/creative reasoning (tarka), and absorption/intense spiritual union (samadhi).
In addition to the Yoga discussion in above Principal Upanishads, twenty Yoga Upanishads as well as related texts such as Yoga Vasistha, composed in 1st and 2nd millennium CE, discuss Yoga methods.
Yoga is discussed in the ancient foundational Sutras of Hindu philosophy. The Vaiśeṣika Sūtra of the Vaisheshika school of Hinduism, dated to have been composed sometime between 6th and 2nd century BCE discusses Yoga.[note 17] According to Johannes Bronkhorst, an Indologist known for his studies on early Buddhism and Hinduism and a professor at the University of Lausanne, Vaiśeṣika Sūtra describes Yoga as "a state where the mind resides only in the soul and therefore not in the senses". This is equivalent to pratyahara or withdrawal of the senses, and the ancient Sutra asserts that this leads to an absence of sukha (happiness) and dukkha (suffering), then describes additional yogic meditation steps in the journey towards the state of spiritual liberation.
Similarly, Brahma sutras – the foundational text of the Vedanta school of Hinduism, discusses yoga in its sutra 2.1.3, 2.1.223 and others. Brahma sutras are estimated to have been complete in the surviving form sometime between 450 BCE to 200 CE, and its sutras assert that yoga is a means to gain "subtlety of body" and other powers. The Nyaya sutras – the foundational text of the Nyaya school, variously estimated to have been composed between the 6th-century BCE and 2nd-century CE, discusses yoga in sutras 4.2.38–50. This ancient text of the Nyaya school includes a discussion of yogic ethics, dhyana (meditation), samadhi, and among other things remarks that debate and philosophy is a form of yoga.
Alexander the Great reached India in the 4th century BCE. Along with his army, he took Greek academics with him who later wrote memoirs about geography, people and customs they saw. One of Alexander's companion was Onesicritus, quoted in Book 15, Sections 63–65 by Strabo, who describes yogins of India. Onesicritus claims those Indian yogins (Mandanis ) practiced aloofness and "different postures – standing or sitting or lying naked – and motionless".
Onesicritus also mentions his colleague Calanus trying to meet them, who is initially denied audience, but later invited because he was sent by a "king curious of wisdom and philosophy". Onesicritus and Calanus learn that the yogins consider the best doctrine of life as "rid the spirit of not only pain, but also pleasure", that "man trains the body for toil in order that his opinions may be strengthened", that "there is no shame in life on frugal fare", and that "the best place to inhabit is one with scantiest equipment or outfit". These principles are significant to the history of spiritual side of yoga. These may reflect the ancient roots of "undisturbed calmness" and "mindfulness through balance" in later works of Hindu Patanjali and Buddhist Buddhaghosa respectively, states Charles Rockwell Lanman; as well as the principle of Aparigraha (non-possessiveness, non-craving, simple living) and asceticism discussed in later Hinduism and Jainism.
Werner states, "The Buddha was the founder of his [Yoga] system, even though, admittedly, he made use of some of the experiences he had previously gained under various Yoga teachers of his time." He notes:
But it is only with Buddhism itself as expounded in the Pali Canon that we can speak about a systematic and comprehensive or even integral school of Yoga practice, which is thus the first and oldest to have been preserved for us in its entirety.
The chronology of completion of these yoga-related Pali Canons, however, is unclear, just like ancient Hindu texts. Early known Buddhist sources like the Majjhima Nikāya mention meditation, while the Anguttara Nikāya describes Jhāyins (meditators) that resemble early Hindu descriptions of Muni, Kesins and meditating ascetics, but these meditation-practices are not called yoga in these texts. The earliest known specific discussion of yoga in the Buddhist literature, as understood in modern context, is from the third- to fourth-century CE scriptures of the Buddhist Yogācāra school and fourth- to fifth-century Visuddhimagga of Buddhaghosa.
A yoga system that predated the Buddhist school is Jain yoga. But since Jain sources postdate Buddhist ones, it is difficult to distinguish between the nature of the early Jain school and elements derived from other schools. Most of the other contemporary yoga systems alluded in the Upanishads and some Pali canons are lost to time.[note 18]
The early Buddhist texts describe meditative practices and states, some of which the Buddha borrowed from the śramaṇa tradition. The Pali canon contains three passages in which the Buddha describes pressing the tongue against the palate for the purposes of controlling hunger or the mind, depending on the passage. However, there is no mention of the tongue being inserted into the nasopharynx as in true khecarī mudrā. The Buddha used a posture where pressure is put on the perineum with the heel, similar to even modern postures used to stimulate Kundalini.
Alexander Wynne, author of The Origin of Buddhist Meditation, observes that formless meditation and elemental meditation might have originated in the Upanishadic tradition. The earliest reference to meditation is in the Brihadaranyaka Upanishad, one of the oldest Upanishads. Chandogya Upanishad describes the five kinds of vital energies (prana). Concepts used later in many yoga traditions such as internal sound and veins (nadis) are also described in the Upanishad. Taittiriya Upanishad defines yoga as the mastery of body and senses.
The Bhagavad Gita ('Song of the Lord'), uses the term "yoga" extensively in a variety of ways. In addition to an entire chapter (ch. 6) dedicated to traditional yoga practice, including meditation, it introduces three prominent types of yoga:
The Gita consists of 18 chapters and 700 shlokas (verses), with each chapter named as a different yoga, thus delineating eighteen different yogas. Some scholars divide the Gita into three sections, with the first six chapters with 280 shlokas dealing with Karma yoga, the middle six containing 209 shlokas with Bhakti yoga, and the last six chapters with 211 shlokas as Jnana yoga; however, this is rough because elements of karma, bhakti and jnana are found in all chapters.
Description of an early form of yoga called nirodhayoga (yoga of cessation) is contained in the Mokshadharma section of the 12th chapter (Shanti Parva) of the Mahabharata. The verses of the section are dated to c. 300–200 BCE. Nirodhayoga emphasizes progressive withdrawal from the contents of empirical consciousness such as thoughts, sensations etc. until purusha (Self) is realized. Terms like vichara (subtle reflection), viveka (discrimination) and others which are similar to Patanjali's terminology are mentioned, but not described. There is no uniform goal of yoga mentioned in the Mahabharata. Separation of self from matter, perceiving Brahman everywhere, entering into Brahman etc. are all described as goals of yoga. Samkhya and yoga are conflated together and some verses describe them as being identical. Mokshadharma also describes an early practice of elemental meditation.
This period witnessed many texts of Buddhism, Hinduism and Jainism discussing and systematically compiling yoga methods and practices. Of these, Patanjali's Yoga Sutras are considered as a key work.
During the period between the Mauryan and the Gupta eras (c. 200 BCE–500 CE) philosophical schools of Hinduism, Buddhism and Jainism were taking form and a coherent philosophical system of yoga began to emerge.
Yoga as a philosophy is mentioned in Sanskrit texts dated to be completed between 200 BCE–200 CE. Kauṭilya's Arthashastra in verse 1.2.10, for example, states that there are three categories of anviksikis (philosophies) – Samkhya (nontheistic), Yoga (theistic) and Cārvāka (atheistic materialism).
Many traditions in India began to adopt systematic methodology by about first century CE. Of these, Samkhya was probably one of the oldest philosophies to begin taking a systematic form. Patanjali systematized Yoga, building them on the foundational metaphysics of Samkhya. In the early works, the Yoga principles appear together with the Samkhya ideas. Vyasa's commentary on the Yoga Sutras, also called the Samkhyapravacanabhasya (Commentary on the Exposition of the Sankhya Philosophy), describes the relation between the two systems. The two schools have some differences as well. Yoga accepted the conception of "personal god", while Samkhya developed as a rationalist, non-theistic/atheistic system of Hindu philosophy. Sometimes Patanjali's system is referred to as Seshvara Samkhya in contradistinction to Kapila's Nirivara Samkhya.
The parallels between Yoga and Samkhya were so close that Max Müller says that "the two philosophies were in popular parlance distinguished from each other as Samkhya with and Samkhya without a Lord."
|Pada (Chapter)||English meaning||Sutras|
|Samadhi Pada||On being absorbed in spirit||
|Sadhana Pada||On being immersed in spirit||
|Vibhuti Pada||On supernatural abilities and gifts||
|Kaivalya Pada||On absolute freedom||
In Hindu philosophy, yoga is the name of one of the six orthodox (which accept the testimony of Vedas) philosophical schools. Karel Werner, author of Yoga And Indian Philosophy, believes that the process of systematization of yoga which began in the middle and Yoga Upanishads culminated with the Yoga Sutras of Patanjali.[note 19]
There are numerous parallels in the concepts in ancient Samkhya, Yoga and Abhidharma Buddhist schools of thought, particularly from 2nd century BCE to 1st century AD, notes Larson. Patanjali's Yoga Sutras is a synthesis of these three traditions. From Samkhya, Yoga Sutras adopt the "reflective discernment" (adhyavasaya) of prakrti and purusa (dualism), its metaphysical rationalism, as well its three epistemic methods to gaining reliable knowledge. From Abhidharma Buddhism's idea of nirodhasamadhi, suggests Larson, Yoga Sutras adopt the pursuit of altered state of awareness, but unlike Buddhist's concept of no self nor soul, Yoga is physicalist and realist like Samkhya in believing that each individual has a self and soul. The third concept Yoga Sutras synthesize into its philosophy is the ancient ascetic traditions of meditation and introspection, as well as the yoga ideas from middle Upanishads such as Katha, Shvetashvatara and Maitri.
Patanjali's Yoga Sutras are widely regarded as the first compilation of the formal yoga philosophy. The verses of Yoga Sutras are terse. Many later Indian scholars studied them and published their commentaries, such as the Vyasa Bhashya (c. 350–450 CE). Patanjali's yoga is also referred to as Raja yoga. Patanjali defines the word "yoga" in his second sutra:
- Yoga Sutras 1.2
This terse definition hinges on the meaning of three Sanskrit terms. I. K. Taimni translates it as "Yoga is the inhibition (nirodhaḥ) of the modifications (vṛtti) of the mind (citta)". Swami Vivekananda translates the sutra as "Yoga is restraining the mind-stuff (Citta) from taking various forms (Vrittis)." Edwin Bryant explains that, to Patanjali, "Yoga essentially consists of meditative practices culminating in attaining a state of consciousness free from all modes of active or discursive thought, and of eventually attaining a state where consciousness is unaware of any object external to itself, that is, is only aware of its own nature as consciousness unmixed with any other object."
If the meaning of yoga is understood as the practice of nirodha (mental control), then its goal is "the unqualified state of niruddha (the perfection of that process)", according to Baba Hari Dass. In that context, "yoga (union) implies duality (as in joining of two things or principles); the result of yoga is the nondual state", and "as the union of the lower self and higher Self. The nondual state is characterized by the absence of individuality; it can be described as eternal peace, pure love, Self-realization, or liberation."
Patanjali's writing also became the basis for a system referred to as "Ashtanga Yoga" ("Eight-Limbed Yoga"). This eight-limbed concept is derived from the 29th Sutra of the Book 2 of Yoga Sutras. They are:
Yoga and Vedanta are the two largest surviving schools of Hindu traditions. They share many thematic principles, concepts and belief in self/soul, but diverge in degree, style and some of their methods. Epistemologically, Yoga school accepts three means to reliable knowledge, while Advaita Vedanta accepts six ways. Yoga disputes the monism of Advaita Vedanta. Yoga school believes that in the state of moksha, each individual discovers the blissful, liberating sense of himself or herself as an independent identity; Advaita Vedanta, in contrast, believes that in the state of moksha, each individual discovers the blissful, liberating sense of himself or herself as part of Oneness with everything, everyone and the Universal Self. They both hold that the free conscience is aloof yet transcendent, liberated and self-aware. Further, Advaita Vedanta school enjoins the use of Patanjali's yoga practices and the reading of Upanishads for those seeking the supreme good, ultimate freedom and jivanmukti.
The Yoga Yajnavalkya is a classical treatise on yoga attributed to the Vedic sage Yajnavalkya. It takes the form of a dialogue between Yajnavalkya and Gargi, a renowned philosopher. The text contains 12 chapters and its origin has been traced to the period between the second century BCE and fourth century CE. Many yoga texts like the Hatha Yoga Pradipika, the Yoga Kundalini and the Yoga Tattva Upanishads have borrowed verses from or make frequent references to the Yoga Yajnavalkya. The Yoga Yajnavalkya discusses eight yoga Asanas – Swastika, Gomukha, Padma, Vira, Simha, Bhadra, Mukta and Mayura, numerous breathing exercises for body cleansing, and meditation.
According to Tattvarthasutra, 2nd century CE Jain text, yoga is the sum of all the activities of mind, speech and body. Umasvati calls yoga the cause of "asrava" or karmic influx as well as one of the essentials—samyak caritra—in the path to liberation. In his Niyamasara, Acarya Kundakunda, describes yoga bhakti—devotion to the path to liberation—as the highest form of devotion. Acarya Haribhadra and Acarya Hemacandra mention the five major vows of ascetics and 12 minor vows of laity under yoga. This has led certain Indologists like Prof. Robert J. Zydenbos to call Jainism, essentially, a system of yogic thinking that grew into a full-fledged religion. The five yamas or the constraints of the Yoga Sutras of Patanjali bear a resemblance to the five major vows of Jainism, indicating a history of strong cross-fertilization between these traditions.[note 20]
In the late phase of Indian antiquity, on the eve of the development of Classical Hinduism, the Yogacara movement arises during the Gupta period (4th to 5th centuries). Yogacara received the name as it provided a "yoga," a framework for engaging in the practices that lead to the path of the bodhisattva. The yogacara sect teaches "yoga" as a way to reach enlightenment.
Middle Ages saw the development of many satellite traditions of yoga. Hatha yoga emerged in this period.
The Bhakti movement was a development in medieval Hinduism which advocated the concept of a personal God (or "Supreme Personality of Godhead"). The movement was initiated by the Alvars of South India in the 6th to 9th centuries, and it started gaining influence throughout India by the 12th to 15th centuries. Shaiva and Vaishnava bhakti traditions integrated aspects of Yoga Sutras, such as the practical meditative exercises, with devotion. Bhagavata Purana elucidates the practice of a form of yoga called viraha (separation) bhakti. Viraha bhakti emphasizes one pointed concentration on Krishna.
Tantra is a genre of yoga that arose in India no later than the 5th century CE.[note 21] George Samuel states, "Tantra" is a contested term, but may be considered as a school whose practices appeared in mostly complete form in Buddhist and Hindu texts by about 10th century CE. Over its history, some ideas of Tantra school influenced the Hindu, Bon, Buddhist, and Jain traditions. Elements of Tantric yoga rituals were adopted by and influenced state functions in medieval Buddhist and Hindu kingdoms in East and Southeast Asia.
Vajrayana is also known as Tantric Buddhism and Tantrayāna. Its texts were compiled starting with 7th century and Tibetan translations were completed in 8th century CE. These tantra yoga texts were the main source of Buddhist knowledge that was imported into Tibet. They were later translated into Chinese and other Asian languages, helping spread ideas of Tantric Buddhism. The Buddhist text Hevajra Tantra and Caryāgiti introduced hierarchies of chakras. Yoga is a significant practice in Tantric Buddhism.
The tantra yoga practices include asanas and breathing exercises. The Nyingma tradition practices Yantra yoga (Tib. "Trul khor"), a discipline that includes breath work (or pranayama), meditative contemplation and other exercises. In the Nyingma tradition, the path of meditation practice is divided into further stages, such as Kriya yoga, Upa yoga, Yoga yana, Mahā yoga, Anu yoga and Ati yoga. The Sarma traditions also include Kriya, Upa (called "Charya"), and Yoga, with the Anuttara yoga class substituting for Mahayoga and Atiyoga.
Zen, the name of which derives from the Sanskrit "dhyāna" via the Chinese "ch'an"[note 22] is a form of Mahayana Buddhism. Yoga practices integrally exist within the Zen Buddhist school.[note 23] Certain essential elements of yoga are important both for Buddhism in general and for Zen in particular.
The earliest references to hatha yoga are in Buddhist works dating from the eighth century. The earliest definition of hatha yoga is found in the 11th century Buddhist text Vimalaprabha, which defines it in relation to the center channel, bindu etc. Hatha yoga synthesizes elements of Patanjali's Yoga Sutras with posture and breathing exercises. It marks the development of asanas (plural) into the full body 'postures' now in popular usage and, along with its many modern variations, is the style that many people associate with the word yoga today.
Various yogic groups had become prominent in Punjab in the 15th and 16th century, when Sikhism was in its nascent stage. Compositions of Guru Nanak, the founder of Sikhism, describe many dialogues he had with Jogis, a Hindu community which practiced yoga. Guru Nanak rejected the austerities, rites and rituals connected with Hatha Yoga. He propounded the path of Sahaja yoga or Nama yoga (meditation on the name) instead. The Guru Granth Sahib states:
Listen "O Yogi, Nanak tells nothing but the truth. You must discipline your mind. The devotee must meditate on the Word Divine. It is His grace which brings about the union. He understands, he also sees. Good deeds help one merge into Divination."
Yoga came to the attention of an educated western public in the mid-19th century along with other topics of Indian philosophy. In the context of this budding interest, N. C. Paul published his Treatise on Yoga Philosophy in 1851.
The first Hindu teacher to actively advocate and disseminate aspects of yoga to a western audience, Swami Vivekananda, toured Europe and the United States in the 1890s. The reception which Swami Vivekananda received built on the active interest of intellectuals, in particular the New England Transcendentalists, among them Ralph Waldo Emerson (1803–1882), who drew on German Romanticism and the interest of philosophers and scholars like G. W. F. Hegel (1770–1831), the brothers August Wilhelm Schlegel (1767–1845) and Karl Wilhelm Friedrich Schlegel (1772–1829), Max Mueller (1823–1900), Arthur Schopenhauer (1788–1860), and others who had (to varying degrees) interests in things Indian.
Theosophists also had a large influence on the American public's view of Yoga. Esoteric views current at the end of the 19th century provided a further basis for the reception of Vedanta and of Yoga with its theory and practice of correspondence between the spiritual and the physical. The reception of Yoga and of Vedanta thus entwined with each other and with the (mostly Neoplatonism-based) currents of religious and philosophical reform and transformation throughout the 19th and early 20th centuries. M. Eliade, himself rooted in the Romanian currents of these traditions, brought a new element into the reception of Yoga with the strong emphasis on Tantric Yoga in his seminal book: Yoga: Immortality and Freedom.[note 24] With the introduction of the Tantra traditions and philosophy of Yoga, the conception of the "transcendent" to be attained by Yogic practice shifted from experiencing the "transcendent" ("Atman-Brahman" in Advaitic theory) in the mind to the body itself.
The American born yogi by the name of Pierre Arnold Bernard, after his travels through the lands of Kashmir and Bengal, founded the Tantrik Order of America in 1905. His teachings gave many westerners their first glimpse into the practices of yoga and tantra.
The modern scientific study of yoga began with the works of N. C. Paul and Major D. Basu in the late 19th century, and then continued in the 20th century with Sri Yogendra (1897–1989) and Swami Kuvalayananda. Western medical researchers came to Swami Kuvalayananda's Kaivalyadhama Health and Yoga Research Center, starting in 1928, to study Yoga as a science.
Outside of Buddhist, Hindu and Jain traditions in Asia, the term "yoga" has been usually synonymous with its asanas (postures) or as a form of exercise. This aspect of Yoga was adopted as a cultural trend in Europe and North America starting in the first half of the 20th century. There were periods of criticism and paranoia against yoga as well. By the 1960s, western interest in Hindu spirituality reached its peak, giving rise to a great number of Neo-Hindu schools specifically advocated to a western public. During this period, most of the influential Indian teachers of yoga came from two lineages, those of Sivananda Saraswati (1887–1963) and of Tirumalai Krishnamacharya (1888–1989). Teachers of Hatha yoga who were active in the west in this period included B.K.S. Iyengar (1918–2014), K. Pattabhi Jois (1915–2009), Swami Vishnu-devananda (1927–1993), and Swami Satchidananda (1914–2002). Yogi Bhajan brought Kundalini Yoga to the United States in 1969. Comprehensive, classical teachings of Ashtanga Yoga, Samkhya, the subtle body theory, Fitness Asanas, and tantric elements were included in the yoga teachers training by Baba Hari Dass (1923–), in the United States and Canada.
A second "yoga boom" followed in the 1980s, as Dean Ornish, a follower of Swami Satchidananda, connected yoga to heart health, legitimizing yoga as a purely physical system of health exercises outside of counter-culture or esotericism circles, and unconnected to any religious denomination. Numerous asanas seemed modern in origin, and strongly overlapped with 19th and early-20th century Western exercise traditions.
Since 2001, the popularity of yoga in the USA has expanded. The number of people who practiced some form of yoga has grown from 4 million (in 2001) to 20 million (in 2011). It has drawn support from world leaders such as Barack Obama who stated, "Yoga has become a universal language of spiritual exercise in the United States, crossing many lines of religion and cultures,... Every day, millions of people practice yoga to improve their health and overall well-being. That's why we're encouraging everyone to take part in PALA (Presidential Active Lifestyle Award), so show your support for yoga and answer the challenge".
The American College of Sports Medicine supports the integration of yoga into the exercise regimens of healthy individuals as long as properly-trained professionals deliver instruction. The College cites yoga's promotion of "profound mental, physical and spiritual awareness" and its benefits as a form of stretching, and as an enhancer of breath control and of core strength.
Yoga has been studied and may be recommended to promote relaxation, reduce stress and improve some medical conditions such as premenstrual syndrome. Yoga is considered to be a low-impact activity that can provide the same benefits as "any well-designed exercise program, increasing general health and stamina, reducing stress, and improving those conditions brought about by sedentary lifestyles". It is particularly promoted as a physical therapy routine, and as a regimen to strengthen and balance all parts of the body.
Yoga may improve psychological health during cancer treatment, although more evidence is needed to confirm this possible benefit. Other research indicated that yoga could be a useful in addition to other treatments in schizophrenia, and may have positive effects on mental health, although the quality of research to define these effects is low.
In 2015 the Australian Government's Department of Health published the results of a review of alternative therapies that sought to determine if any were suitable for being covered by health insurance. Yoga was one of 17 practices evaluated for which no clear evidence of effectiveness was found. Accordingly In 2017 the Australian government named yoga as a practice that would not qualify for insurance subsidy, saying this step would "ensure taxpayer funds are expended appropriately and not directed to therapies lacking evidence".
While some of the medical community regards the results of yoga research as significant, others point to many flaws which undermine results. Much of the research on yoga has taken the form of preliminary studies or clinical trials of low methodological quality, including small sample sizes, inadequate blinding, lack of randomization, and high risk of bias. A 2013 review described the effectiveness of yoga for low back pain in the short-term, and moderate evidence that it was effective in the long-term. Another study found an incidence of back injuries from yoga.
Some clinicians have reported studies investigating yoga as a complementary intervention for cancer patients to decrease depression, insomnia, pain, and fatigue and to increase anxiety control. Others have questioned the quality of research and uncertainty in proving this effect.
Some yoga practitioners suffer physical injuries analogous to sports injuries. A survey of yoga practitioners in Australia showed that about 20% had suffered some physical injury while practicing yoga. In the previous 12 months 4.6% of the respondents had suffered an injury producing prolonged pain or requiring medical treatment. Headstands, shoulder stands, lotus and half lotus (seated cross-legged position), forward bends, backward bends, and handstands produced the greatest number of injuries.
Among the main reasons that experts cite for causing negative effects from yoga are beginners' competitiveness and instructors' lack of qualification. As the demand for yoga classes grows, many people get certified to become yoga instructors, often with relatively little training. Not every newly certified instructor can evaluate the condition of every new trainee in their class and recommend refraining from doing certain poses or using appropriate props to avoid injuries. In turn, a beginning yoga student can overestimate the abilities of their body and strive to do advanced poses before their body is flexible or strong enough to perform them.
Vertebral artery dissection, a tear in the arteries in the neck which provide blood to the brain can result from rotation of the neck while the neck is extended. This can occur in a variety of contexts, but is an event which could occur in some yoga practices. This is a very serious condition which can result in a stroke.
It is claimed that yoga can be an excellent training for children and adolescents, both as a form of physical exercise and for breathing, focus, mindfulness, and stress relief: many school districts have considered incorporating yoga into their Physical Education programs. The Encinitas, California school district gained a San Diego Superior Court Judge's approval to use yoga in Physical Education, holding against the parents who claimed the practice was intrinsically religious and hence should not be part of a state funded program.
Some Christians integrate yoga and other aspects of Eastern spirituality with prayer and meditation. This has been attributed to a desire to experience God in a more complete way. In 2013, Monsignor Raffaello Martinelli, servicing Congregation for the Doctrine of the Faith, having worked for over 23 years with Cardinal Joseph Ratzinger (Pope Benedict XVI), said that for his Meditation, a Christian can learn from other religious traditions (zen, yoga, controlled respiration, Mantra), quoting Aspects of Christian meditation: "Just as "the Catholic Church rejects nothing of what is true and holy in these religions," neither should these ways be rejected out of hand simply because they are not Christian. On the contrary, one can take from them what is useful so long as the Christian conception of prayer, its logic and requirements are never obscured. It is within the context of all of this that these bits and pieces should be taken up and expressed anew." Previously, the Roman Catholic Church, and some other Christian organizations have expressed concerns and disapproval with respect to some eastern and New Age practices that include yoga and meditation.
In 1989 and 2003, the Vatican issued two documents: Aspects of Christian meditation and "A Christian reflection on the New Age," that were mostly critical of eastern and New Age practices. The 2003 document was published as a 90-page handbook detailing the Vatican's position. The Vatican warned that concentration on the physical aspects of meditation "can degenerate into a cult of the body" and that equating bodily states with mysticism "could also lead to psychic disturbance and, at times, to moral deviations." Such has been compared to the early days of Christianity, when the church opposed the gnostics' belief that salvation came not through faith but through a mystical inner knowledge. The letter also says, "one can see if and how [prayer] might be enriched by meditation methods developed in other religions and cultures" but maintains the idea that "there must be some fit between the nature of [other approaches to] prayer and Christian beliefs about ultimate reality." Some[which?] fundamentalist Christian organizations consider yoga to be incompatible with their religious background, considering it a part of the New Age movement inconsistent with Christianity.
Another view holds that Christian meditation can lead to religious pluralism. This is held by an interdenominational association of Christians that practice it. "The ritual simultaneously operates as an anchor that maintains, enhances, and promotes denominational activity and a sail that allows institutional boundaries to be crossed." 
In early 11th century, the Persian scholar Al Biruni visited India, lived with Hindus for 16 years, and with their help translated several significant Sanskrit works into Arabic and Persian languages. One of these was Patanjali's Yogasutras. Al Biruni's translation preserved many of the core themes of Patañjali 's Yoga philosophy, but certain sutras and analytical commentaries were restated making it more consistent with Islamic monotheistic theology. Al Biruni's version of Yoga Sutras reached Persia and Arabian peninsula by about 1050 AD. Later, in the 16th century, the hath yoga text Amritakunda was translated into Arabic and then Persian. Yoga was, however, not accepted by mainstream Sunni and Shia Islam. Minority Islamic sects such as the mystic Sufi movement, particularly in South Asia, adopted Indian yoga practises, including postures and breath control. Muhammad Ghawth, a Shattari Sufi and one of the translators of yoga text in 16th century, drew controversy for his interest in yoga and was persecuted for his Sufi beliefs.
Malaysia's top Islamic body in 2008 passed a fatwa, prohibiting Muslims from practicing yoga, saying it had elements of Hinduism and that its practice was blasphemy, therefore haraam. Some Muslims in Malaysia who had been practicing yoga for years, criticized the decision as "insulting." Sisters in Islam, a women's rights group in Malaysia, also expressed disappointment and said yoga was just a form of exercise. This fatwa is legally enforceable. However, Malaysia's prime minister clarified that yoga as physical exercise is permissible, but the chanting of religious mantras is prohibited.
In 2009, the Council of Ulemas, an Islamic body in Indonesia, passed a fatwa banning yoga on the grounds that it contains Hindu elements. These fatwas have, in turn, been criticized by Darul Uloom Deoband, a Deobandi Islamic seminary in India. Similar fatwas banning yoga, for its link to Hinduism, were issued by the Grand Mufti Ali Gomaa in Egypt in 2004, and by Islamic clerics in Singapore earlier.
In Iran, as of May 2014, according to its Yoga Association, there were approximately 200 yoga centres in the country, a quarter of them in the capital Tehran, where groups can often be seen practising in parks. This has been met by opposition among conservatives. In May 2009, Turkey's head of the Directorate of Religious Affairs, Ali Bardakoğlu, discounted personal development techniques such as reiki and yoga as commercial ventures that could lead to extremism. His comments were made in the context of reiki and yoga possibly being a form of proselytization at the expense of Islam.
On 11 December 2014, the United Nations General Assembly approved a resolution establishing 21 June as "International Day of Yoga", following the call for its adoption by Indian Prime Minister Narendra Modi during his address to UN General Assembly on 27 September 2014. In suggesting one of the two solstices, Modi noted that it is the longest day of the year in the Northern Hemisphere and that it has special significance in many parts of the world.
The first International Day of Yoga was observed worldwide on 21 June 2015. About 35,000 people, including Modi and many dignitaries, performed 21 yoga asanas for 35 minutes at Rajpath in New Delhi. The day devoted to yoga was observed by millions across the world. The event at Rajpath established two Guinness records – largest Yoga Class with 35,985 people and the record for the most nationalities participating in it—84.
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Quote: The Fatwas of Religious Council in Islamic affairs on Yoga. After carefully studied various reports and factual data, the Council unanimously agreed that this ancient India religious teachings, which involves physical and mental exercises, are Hinduism in nature known as wahdat al-wujud philosophy (oneness of existence; the realization of identity between the Self in man, Atman; and the Divine, BRAHMAN: ‘Brahman is all, and Atman is Brahman'). It is prohibited (haram) for Muslims to practice it.