The factors that affect the flexibility, that is, the range of joint activity, are: the structure of joint bone, the volume of tissues around the joint, the extensibility of ligament, tendon, muscle and skin; Among them, the last item has the greatest impact on improving flexibility.
Flexibility depends not only on structural changes, but also on the adjustment of nerves to skeletal muscle, especially the coordination of muscle relaxation and tension. The improvement of coordination can ensure the increase of action range. Flexibility can be improved by lengthening muscles, tendons and ligaments, including explosive (sharp elongation) and gradual. Among them, gradual relaxation can relax muscles and lengthen tendons slowly, which is not easy to cause injury.
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