When people think about muscles, they think about strength. However, muscles have two jobs: to contract and to relax. Muscle contraction causes the muscle fibers to shorten in length, pulling the attached bones with it. This muscle action is the bases of all skeletal movement. If the muscle does not relax after contraction, it is considered hypertonic, spastic or over-active. Hypertonicity causes the skeleton to get stuck in all sorts of abnormal positions and postures. And hypertonicity...
