Strength training has helped my players the most in preventing injury. Tennis players all have out of balance bodies that will always be out of balance due to serving more than any other shot. Strength training will help balance the body and build the muscles and tendons. The key to staying fit for competitive play is to make sure you train in the gym within 24 hours of hard tennis play. Strenuous tennis will make your body pull toward those imbalances, and strength training within a day of hard play will make your muscles pull toward your last workout instead of the tennis. Just resting will pull your body toward your imbalance.
Southern California Tennis Academy