Most of the shoulder injuries happen because of the excessive forces that tennis creates on the tendons of the shoulder muscles. If the shoulder muscles are weak or tight or if there are imbalances, the motion in the shoulder doesn’t happen correctly and the constant repetitive forces of tennis strokes will create problems and injuries over time. In the past article you have learned how to strengthen the notoriously weak external rotator cuff. Besides strengthening you should always stretch the shoulder muscles – give a lot of attention to your rotator cuff! And include a little chest stretch too.