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One of the problems with using only static stretches is that they are usually performed on the ground, causing body temperature and respiration to decrease. More importantly, this type of stretching is not dynamic. <br>To understand the relevance of the dynamic component in conditioning exercises, consider that during sports activities, muscle groups and their opposing muscles are involved in a complex pattern of contracting and relaxing at high speeds. In fact, because angular limb velocities reach values often greater than 300 degrees of movement per second, there are very few weight training exercises that can truly be called sport-specific. Many dynamic movements with a medicine ball can be performed at high speeds and will keep the body warmed-up and ready for serious athletic training.<br>Let me give you an example of the value of adding medicine balls to traditional training from my years as a strength coach at the Air Force Academy. During the off-season the  skill players on the football team would lift on Monday, Wednesday and Friday, and perform speed, agility and endurance drills on Tuesday and Thursday. A major portion of the Tuesday and Thursday workouts was spent in dynamic medicine ball exercises to provide resistance during traditional calisthenics, especially those designed to work the abdominal and lower back muscles. <br>Remember how boring sit-ups are? One partner exercise especially popular at the Academy was partner sit-ups with a medicine ball. As shown above, the athletes lock their ankles together and toss the ball back and forth, performing a sit-up as they throw it. Because the ball is moving rapidly, when the athletes catch it the abdominals get a much tougher workout than if the athletes simply held the ball on their chests.<br>One exercise that was especially tough was a series of push-ups with one or both hands resting on a medicine ball, as demonstrated on page 56. This exercise emphasizes many of the smaller muscles of the shoulder that stabilize the joint, and it s much tougher than it sounds. In fact, the Air Force Academy tried to incorporate these types of push-ups during a toughness training ritual called  Recognition Week that every cadet must endure. However, after the cadets had performed dozens of these push-ups, we received a call from the supervising officer to stop them because the cadets upper bodies were too exhausted to continue the remainder of their physical tasks!<br><br>Power Training<br><br>What the medicine ball is especially good for is power development. Power can be defined as  work performed over time. Medicine balls take the strength developed from high-tension lifts such as the squat and teach the body and mind to use that strength faster. In sports, you have only a fraction of a second to return that tennis serve or to break that tackle. This is exactly why athletes who excel in the weight room often may be outplayed by physically weaker opponents who can apply a given level of strength more quickly.<br>For most athletes, especially beginning-level and most high school athletes, power cleans and push jerks can produce significant improvements in power. And with limited amounts of time available to most of these athletes, the basic BFS system is perfect. However, athletes who