Here is another example from the serve. Many players face the net or open their body too soon during the serve (figure 11.2a). The result is that most of the power is supplied by the arm and shoulder rather than from the legs upward followed by a rotation of the large muscles of the hips, trunk, and upper body. Eventually, the arm will become fatigued, and overuse will put inordinate strain on the serving arm or on the rotator cuff muscles of the shoulder area. If you keep using that same serve, an overuse injury will be the likely result, possibly leading to surgery. Keep your shoulders sideways until the racket has actually moved into the hitting area of the serve, and let your body naturally follow the racket (figure 11.2b).