Functional exercise for rotator cuff injuries is very important for recovery after surgery. Functional exercise is partially different for each patient, so be sure to follow the surgeon’s instructions. Overall, the functional exercises for postoperative rotator cuff injury are divided into the following stages: 1. 0-6 weeks: The shoulder joint is in the functional recovery period, when the main focus is on passive activities, usually wearing an abduction brace to keep the shoulder joint abducted, so that the rotator cuff tension is reduced and growth healing takes place. In this process, passive exercises are mainly taken, such as pendulum exercises, in which the affected side is supported by the healthy hand, and pendulum exercises are performed to make abduction, external rotation and internal rotation to improve the shoulder joint adhesions. However, during this process, you must be careful not to move too much, so as not to cause shoulder pain. 2. 6-12 weeks: At this time, under the guidance of the doctor, you can perform moderate active functional exercises. opposing exercises to improve the shoulder joint muscle strength. Because of the long-term activity restriction, muscle atrophy may occur, which needs to be recovered through exercise. At this time, the functional exercise mainly focuses on the recovery of muscle strength, and you can do simple counteracting exercises to reach the state of daily life. However, during this process, attention should be paid to protecting the shoulder joint and avoiding movements that exceed the range of motion of the shoulder joint to avoid causing new rotator cuff injuries. In conclusion, post-operative functional exercises for rotator cuff injury must be done under the strict guidance of a doctor and in accordance with individualized exercise methods.