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In reality, I believe the problem was that the machines I was using had force curves that were designed on the basis of 1-rep maxes, not the multiple repetitions I was using and the manufacturers recommended. <BR>There have been various attempts to provide appropriate resistance for all types of strength curves. One former Mr. Universe and gym owner changed his Nautilus machines to use circular pulleys and found they worked much better. David, an exercise equipment company in Sweden, designed its machines to adjust to the curves displayed during higher repetitions. In a David leg extension, for example, there would be minimal resistance at the end of the exercise, exactly opposite of how the cam works on a Nautilus machine. Another refinement was isokinetic machines, which allow the athlete to perform exercises at one movement speed. With such machines, resistance is applied only when movement occurs, so that no work is being performed during the isometric (pause) and eccentric (lowering) portions of the exercise. This is a major problem.<BR>Research has shown that the eccentric portion of an exercise is the most effective type of muscular contraction for developing strength, and eccentric strength is important for developing the ability to control the forces that occur in sports, such as landing during a jump in volleyball or basketball.  Also, because these machines only allow for one movement speed and because acceleration is an important component to the development and maintenance of power, these machines would be detrimental to athletic performance, says Jerry Telle, ay between their front-side and backside mechanics. What I find is that due to a lack of basic strength, our younger sprinters often have developed significantly greater backside mechanics, reducing front-side mechanics. As a result, braking action increases, severely restricting force application as they sprint down the track at maximum velocity.<br><br>BFS: Some coaches believe that by the time an athlete reaches college, many technique flaws are so ingrained that they are virtually impossible to correct. Do you agree?<br>DS: Not at all. When we get a new person in, it s exciting to see that there are things we can do to help them improve. Of course there s no denying that it takes tremendous patience to correct technique flaws. Muna Lee is a perfect example. When she initially enrolled she couldn t lift a 45-pound bar. I told her,  You watch---this is going to be fun; once you get a little bit stronger it ll make a difference on the track. Specifically, she would be able to apply the forces on the track in a mechanically different way that would make her faster. And it was true; her new training enabled her to run significantly faster than she did in her senior year of high school.<br><br>BFS: How do you use testing in your program?<br>DS: It s vital to test athletes to pin down what is keeping them from achieving their potential. 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