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If you re walking with the sled, you want to make certain your walk is dynamic with a long, deep step - you want to work the muscles through a long range of motion. I weigh 180 pounds, and I ve gotten up to being able to use 200 pounds. Greco notes that the intensity involved in using the sled makes it easy to overtrain and he usually doesn t use heavy sled work for longer than three weeks straight. He adds,  Powerlifters can do more of the heavy sled work, because they don t run in addition to their regular training. <br>One alternative to the sprint sled is the BFS speed harness. Instead of a sled providing the resistance, a coach or training partner holds onto the end of a rope attached to the harness and provides manual resistance. <br><br><br>Sprint Chute Training Secrets<br><br>Although both Adams and Greco tend to use the sprint chute to improve maximum running velocity (or speed-endurance as some prefer to call it), there are many other benefits.<br><br>According to Greco, because the chute can move back and forth, it creates an unstable environment that can be used to improve joint stability.  I actually like it for team sports. Take the example of football running backs who are basically running and people are hitting them from the side. I think this instability helps significantly . . . and even with sprinters, beause if you re coming off a curve and there s a gust of wind that throws you to the side, your body has to get used to that. <br><br>Another advantage of the sprint chute (and the smaller version BFS offers called the power chute) is that it can improve running technique. Greco sometimes uses a 100-meter, rhythmical type of run.  When you have some resistance you tend to focus on your technique a little more. What happens when your technique is not sound when you use a chute is that it feels as if you re working too hard. <br><br>How you take advantage of the many uses of BFS sprint sleds and sprint chutes depends upon the types of athletes you re working with, and of course, at what level. The bottom line is these can be valuable training devices for those who are serious about fulfilling their athletic potential. There s no argument about that!rm of a question at BFS Clinics. Every time, every kid says that variation is better. I guess that was what was so frustrating. Why do research on something everyone knows? I want to see research done on different adjustment possiblities within periodization. Dr. Stone answered, "There is still a lot of people that don't know variation is best. That's why I presented those particular studies." The studies presented were fine and interesting but we in 1996 should be way beyond that. Dr. Stone concluded, "It's not the work that is important but how you manipulate the variables." 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