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He agrees with Adams that the sled is best for developing acceleration.  You seldom want to pull a heavy sled past 25 yards, because that ignores how your body works, says Greco.  Once your body goes into an upright position through the transition phase of a sprint, acceleration is basically zero. The problem with using the sled this way is that if you keep pulling it, let s say for 100 yards, you re always working to drive drive drive - it s not natural. Plus you start fatiguing, and when you fatigue, you start to see a breakdown in body mechanics -it s like doing sets of 15 in the power clean. <brhen they jump, their legs seldom bend beyond the level of a quarter squat. For a scientific consideration of squatting depth, a good source is Vladimir M. Zatsiorsky, a respected Russian sport scientist who served for 18 years as chair of the Department of Biomechanics at the Central Institute of Physical Culture in Moscow. He discusses the accentuation principle in detail in his textbook Science and Practice of trength Training. <br>Zatsiorsky says that if an elite volleyball player were to perform lower body workouts that consisted of partial squats, full squats and leg presses, 60 percent of the total work performed should be with partial squats and only 25 percent with full squats. One reason is that the weight used in a full squat is considerably less than that used in a partial squat (or the BFS box squat), and as such the most important portion of the athlete s lower-body strength curve will not receive maximal overload. (Incidentally, performing full-range exercises adheres to a workout strategy called peak-contraction training.)<br>Accentuation training is popular because it fulfills the requirements of exercise specificity. The principle of exercise specificity says exercises that have the most carryover to specific athletic activities share the same biomechanical properties as the activities the athlete seeks to improve. For example, because a power clean is basically a jump with weights, it would be a better exercise than a bench press for improving the vertical jump of a volleyball player. In fact, as I pointed out in my article  The Power of Giants in the Spring 2001 issue, shot putters who practice the power clean often have exceptional vertical jumps, even those athletes who weigh over 300 pounds. <br>Accentuation training is especially needed in such sports as figure skating, since the additional bodyweight developed from full squats could add extra muscle mass that would decrease jumping height (and, for some athletes, adversely affect the aesthetics of the performance, which greatly influence the athletes placement). Other athletes who may not want to develop additional muscle mass from emphasizing full squats are gymnasts, divers, high jumpers and even swimmers. <br>Let s examine the box squat in more detail by looking at the concept of starting strength.<br><br>Getting a Head Start on the Competition<br><br>First, it s time for some more definitions. During a concentric contraction a muscle develops tension and shortens, causing movement to occur. During an isometric contraction a muscle devel