Tennis is regarded as a year-round sport for those fortunate enough to live in a region with a moderate climate or to have access to an indoor facility. Another group of tennis players has a short season extending from Wimbledon to the U.S. Open. Interestingly, both groups are susceptible to different types of afflictions. Injuries associated with tennis are divided into chronic and acute types. Chronic injuries are those resulting from longstanding overuse, while acute injuries are sudden and short-lived. Many of these injuries can be avoided with proper training, stretching, and technique. Cardiovascular fitness is essential before participating in any vigorous activity. Warm-up exercises and starting off with a slow, deliberate stroke will increase circulation to muscles. A classification of common medical problems associated with tennis would include: Upper extremities The shoulder, elbow and wrist are most susceptible to chronic overuse given the nature of the sport. Since the rotator cuff is responsible for stabilizing the shoulder, a tennis serve can lead to a tear or impingement when executed poorly. Shoulder problems typically develop when the shoulder is lifted to a 90-degree angle. Increasing the angle between the shoulder and torso will minimize the chance of injury. Tennis elbow, acute inflammation of the outer surface of the elbow, is caused by strain during the backhand stroke. A two-handed backhand stroke is helpfu ...