The rotator cuff muscle group consists of subscapularis, supraspinatus, infraspinatus and teres minor, which can help the shoulder joint to complete abduction, adduction, external rotation and forward extension, and at the same time, coordinate the shoulder muscles to complete the stabilization and protection of the shoulder joint. In order to avoid rotator cuff tear caused by excessive repetitive motion, rotator cuff muscle group can be exercised in the following ways under the guidance of doctor. 1. Standing position: one side of the arm is straightened and raised to the right, the other side of the knee is raised by the straightened hand to touch the raised knee, repeat 10 to 15 times after the change of hand and leg, the same action for practice. 2. Prone position: one side of the arm outstretched, lifted to the same height as the shoulder, bend the elbow to keep the bent state, slowly lower the arm, repeat 10 times after the change of hands to repeat the exercise. 3. Side-lying position: Straighten both legs, support the body with the arm near the ground 10 times, and repeat the exercise with the other arm. 4. Standing position: arms slightly backward, thumb down, slowly lift the arm, and then slowly put back to the original position, repeat the exercise. The above methods can simply help rotator cuff muscles to exercise, in addition there are more ways to exercise rotator cuff muscles, each exercise should ensure sufficient rest and under the guidance of professional therapists, such as shoulder, arm pain intensification, you should immediately stop exercising and consult a doctor.