Studies show changes in muscle rom could be from mechanisms, such as a muscles ability to tolerate stretch or its viscoelastic properties. Impulse returns from the cns to reflexively contract that muscle thus resisting the stretch: golgi tendon sends its own message in response to the stretch and increase in tension. Plastic changes difficult to achieve but are doable if deformation occurs by long periods of stretching viscoelastic and plastic change. Ballistic stretching: dynamic stretching, active release stretching, myofascial release stretching. Ballistic stretching: a combination of quick jerking motions between the agonist and antagonist muscles: caution with this technique is the possibility of muscle tears. Should only be done under control by in shape athletes and performed sub maximally. Dynamic stretching: successive contractions of the agonist muscle that results in stretching of the antagonist muscle. A repetitive lunge step would be an example. It is the controlled nature of the contraction that makes it different than a ballistic stretch.