<unk>  is a form of physical exercise in which a specific skeletal muscle (or muscle group) is deliberately elongated to its fullest length (often by abduction from the torso) in order to improve the muscle's felt elasticity and reaffirm comfortable muscle tone. (Weerapong et al 189–206) The result is a feeling of increased muscle control, flexibility and range of motion.<unk>  is also used therapeutically to to alleviate cramps.<unk> , in its most basic form, is a natural and instinctive activity; it is performed by both animals and humans. It can be accompanied by yawning.<unk>  often occurs instinctively after waking from sleep, after long periods of inactivity, or after exiting confined spaces.
Many athletes stretch deliberately before or after exercise in order to increase performance and reduce injury. Whether this is helpful, has no effect, or even has detrimental effects is in dispute. While common, it may not be beneficial for all athletic activities.
Stretching
Twitching
Quenching 
Swelling 
Stripping
Pump
Burping
Plasticity