Upper extremity muscle strength can be reduced with the help of manual retraction training and self retraction training. 1. Manipulation training: the principle is to passively pull the active muscle with the help of professionals to reduce the muscle tension of the active muscle. If the biceps muscle tension is high, the elbow joint can be passively pulled with the help of a rehabilitation physician to make the elbow joint abducted, thus effectively reducing the biceps muscle tension. 2. Self-drawn training: It mainly refers to the purpose of drawing by oneself without the help of other people’s auxiliary force. If the tension of the flexor muscles of the wrist is high, you can take the initiative to place the wrist joint on a table of suitable height and squeeze the wrist joint through the weight of the upper body to reduce the tension of the flexor muscles of the wrist. Note that the above training methods should be carried out under the guidance of a professional physician, so as not to affect the recovery effect due to incorrect direction or strength of force.