Shoulder injuries are frequently caused by athletic activities that involve excessive, repetitive, overhead motion like swimming, tennis, pitching, and weightlifting. Injuries can also occur during everyday activities such washing walls, hanging curtains and gardening. Most problems in the shoulder involve the muscles, ligaments and tendons rather than the bones. Athletes are especially susceptible to shoulder problems. In athletes, shoulder problems can develop slowly through repetitive, intensive training routines. Plyometrics also known as jump training is a training technique designed to increase muscular power and explosiveness. Because plyometric exercises mimic the motions used in sports such as skiing, tennis, football, basketball, volleyball, and boxing, plyometric training often is used to condition professional & amateur adult athletes.