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I asked with skepticism. <br>He just smiled,  Do you want to knock a couple of tenths off your forty? That got my attention! Stefan demonstrated that keeping the knees locked was absolutely essential. You can t bend your knees and stretch the hamstrings. The knees must be locked. Of course Stefan had heard about the argument of creating too much stress on the lower back. What was his answer? Keep the weight very light. An athlete who can do a legitimate Parallel Squat of 500 pounds should only train with about 135 pounds on a SLDL and never do more than 40% of a true Parallel Squat. You don t break records or ever max out. You just always keep it very light. Beginning high school athletes or college athletes start with only 65 pounds.<br>Stefan felt the lock-kneed SLDL was one of the very most important lifts for developing speed. He said the greater your hamstring flexibility, the more fluid of a running movement you can achieve. It s like adding a high grade oil to the pistons of your engine. I personally tested Stefan s flexibility. He could stretch, with locked knees, 9.5 inches past his toes. That partially explains his 4.3 times and his 40-inch Vertical Jump from a stand.<br>We have been endorsing and teaching Stefan s method for the last 15 years. I know without a doubt this is superior way. I have done it both ways. The results, in my mind, are not even close. There is no danger to the lumbar spine area simply because of the very light weight involved. When we trained the Utah Jazz, the players really liked the feel of our method. They felt the SLDL was their second most favorite lift.<br>As far as endangerment to an athlete s spine with our method, our research shows that it is non-existent because of the light weight that is always used. Our BFS Clinicians have collectively trained perhaps as many as 20,000 student-athletes over the last ten years using our SLDL with zero problems. Our BFS SLDL is probably the safest lift we teach. The Hex Baimproving 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, sice 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 develops tension without a change in joint angle; thus no external movement occurs. And during an eccentric contraction, a muscle develops tension and lengthens, also causing movement to occur.<br>One facto