Shoulder joint consists of glenoid of scapula and humeral head. The size of articular surface varies greatly, and the articular capsule is weak and loose. There are about three ligaments connected with tendons, and the deltoid muscle is wrapped on three sides of the acromion. Shoulder joint is the main activity center of developed upper body and upper limb muscles, and the exercise of pectoralis major, latissimus dorsi and triceps brachii can not be separated from the activity and exertion of shoulder joint. There are two kinds of joint noise, one is physiological and the other is pathological. Generally speaking, those who only blink without painful dyskinesia belong to physiological blink and have little effect. If it is easy to cause shoulder soft tissue injury due to insufficient warm-up, inaccurate movements, excessive movements, excessive training, and excessive exertion. It is necessary to pay attention to your shoulder reaction at any time, especially during training. Once you have bad emotions such as pain, you should immediately stop training and then take necessary protective measures or treatments.