Dynamic lacing and stretching movement Dynamic lacing and stretching refers to a series of stretching movements. In other words, athletes don't stay in an action, but swing or jump to stretch muscles or expand the range of motion and flexibility of joints. Here are three kinds of dynamic lacing stretching methods: elastic-impact stretching elastic-impact stretching is an outdated stretching method, which uses the power generated by rapid swing, elastic movement and rebound to force all parts of the body beyond the normal range of activities. The possible dangers of elastic impact stretching outweigh its benefits, and better stretching effect can be obtained by choosing other dynamic stretching methods or PNF stretching methods. The main disadvantages of elastic impact stretching include not giving enough time to the target muscle. Dynamic stretching is different from elastic impact stretching, which uses restraint or gentle elastic or swinging motion to make a specific part of the body reach the limit of its range of motion. This stretching method will gradually increase the intensity of bouncing or swinging, but the action must not be violent or out of control. Don't equate dynamic lacing extension with elastic impact extension. Every movement of dynamic stretching is slow and gentle, and the process and goal are clear. Dynamic stretching will never let the joint go beyond the normal range of motion; However, elastic impact stretching is much stronger, and its goal is to force all parts of the human body to go beyond the limits of their range of activities. Active stretching of single muscle group, referred to as AIS, is a new stretching method developed by Aaron Martes. You can isolate and locate the muscle you want to stretch for 2 seconds. The method is to contract the antagonistic muscle (that is, the contralateral muscle group) and force the stretched muscle group to relax. The active stretching movement of a single muscle group is carried out as follows:

(1) Select the muscle group to be stretched, and then select a stretching posture;

(2) Antagonizing the active contraction of muscle;

(3) fast and smooth extension;

(4) Hold this posture for 1 to 2 seconds, and then relax;

(5) Repeat this stretching exercise for 5 to 10 times.

Although the single muscle group active stretching method has some advantages (especially for professional athletes with good conditions), it has also been criticized. Some people say that this stretching method can't guarantee stretching reflection, because the stretching time is only 2 seconds. This statement goes against basic muscle physiology. For example, the stretching reflex of the thigh will be excited within one third of a second. Therefore, any statement that the single muscle group active stretching method ignores the stretching reflex is subjective.