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I was told by the gym instructors that this was because my earlier training with free weights had altered my natural force curves, and that extended Nautilus-only training would eventually make my muscles balanced and the exercises would feel perfect. 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 devle maintaining proper sprint mechanics to place 6th in the 100-meter hurdles. Now this powerful athlete is focusing on the next 2004 Olympics. Michelle Freeman looks forward to pulling out all the stops and running as fast as she can to claim her goal: the title of Fastest Woman in the World.ichelle Freeman is a track and field athlete <br> who runs too fast. Seriously. She's a world-record hurdler who was ranked number one in the world in 1997 and made the finals of the Olympic Games, but paradoxically, she is just too fast for her event. <br> You can run only as fast as your technique will allow, says Freeman's coach, Beverly Kearney.  Hurdling is a more technical event than sprinting, and Michelle's speed makes it even more difficult for her because there's only so fast you can go between barriers. Michelle is really explosive, and sometimes her competitiveness gets the best of her and as a result she doesn't execute technically as well and the speed takes over. <br>An example of what Coach Kearney is talking about occurred during the Challenge of Champions Race held on June 1, 1997. In this special event in which superstar athletes were pitted in one-on-one competitions, a primed Freeman faced reigning Olympic champion Ludmila Engquist of Sweden. Freeman had an explosive start, and at sixty meters it seemed she would win easily by several steps. But as the race progressed, her technique faltered, and this allowed Engquist to overtake her in the last 30 meters to win 12.82 to Freeman's 12.96. <br>In addition to losing ground to technique, Freeman had been finding it difficult to stay healthy. Coach Kearney remarks,  The hurdles are an extremely violent event in terms of the demands it makes on the body, more so than straight sprints." 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