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A jackknife is an abdominal exercise. This exercise is also known as a "V-Up". Jackknife exercises are designed to strengthen the upper and lower abdominal muscles, particularly the transversus abdominis muscle. There are a number of variations of jackknife exercises that allow people of different ages and ability to work their abdominal muscles. This exercise can be modified by using an exercise ball. The jackknife can be done by lying flat on your back with your arms extended overhead and your feet raised slightly above the floor. The jackknife is completed by slowly bringing your straight arms toward your hips, and lifting your upper
A jackknife is an abdominal exercise. This exercise is also known as a "V-Up". Jackknife exercises are designed to strengthen the upper and lower abdominal muscles, particularly the transversus abdominis muscle. There are a number of variations of jackknife exercises that allow people of different ages and ability to work their abdominal muscles. This exercise can be modified by using an exercise ball. The jackknife can be done by lying flat on your back with your arms extended overhead and your feet raised slightly above the floor. The jackknife is completed by slowly bringing your straight arms toward your hips, and lifting your upper torso
The torso or trunk is an anatomical term for the central part, or the core, of the body of many animals (including humans), from which the head, neck
The neck is the part of the body on many vertebrates that connects the head with the tors ...
off the floor.
Instructions
*Preparation.- Sit on floor or mat. Lie supine with hands to sides. *Execution.- Simultaneously raise knees and torso until hips andknee
In humans and other primates, the knee joins the thigh with the human leg, leg and consists of two joints: one between the femur and tibia (tibiofemoral joint), and one between the femur and patella (patellofemoral joint). It is the largest join ...
s are flexed. Return to starting position with waist
The waist is the part of the abdomen between the rib cage and hips. On people with slim bodies, the waist is the narrowest part of the torso.
''Waistline'' refers to the horizontal line where the waist is narrowest, or to the general appear ...
, hips and knees extended. Repeat.
See also
* Wii FitReferences