Centering muscles, in particular, the inner thigh muscles and the deep lying pelvic and lumbar muscles that “center the joints, keep the body-weight under control and prevent momentum from getting the advantage”. These muscles, which are usually the deepest muscle groups, help maintain buoyancy in movement and works to make sure that no energy is being wasted by carrying parts out of alignment. Ex-centering are the more superficial muscles that move parts “through their arc of movement”, away from the center. So centering muscles draw to the center and ex-centering muscles direct away from the center. “In, movement, however, the weights must depart from the center (ex-centering muscles) and return again (centering). So long as they keep moving under control there is little strain”.