Voluntary may refer to: * Voluntary (music) * Voluntary or volunteer, person participating via

volunteering Volunteering is an elective and freely chosen act of an individual or group giving their time and labor, often for community service. Many volunteers are specifically trained in the areas they work, such as medicine, education, or emergenc ...

/volunteerism * Voluntary

muscle contraction Muscle contraction is the activation of Tension (physics), tension-generating sites within muscle cells. In physiology, muscle contraction does not necessarily mean muscle shortening because muscle tension can be produced without changes in musc ...

See also