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If I want to force him into extension, I ll add a little more weight as this will create a longer ground contact time. <br><br>When Greco introduces sled training to his athletes, he doesn t use any additional weight.  At first I just use the weight of the sled - I just want tem to feel that something is there. He adds that during practice, he varies the weight according to how the athlete is performing that day.  This is where a coach has to watch, because you don t want to see a breakdown in technique-you don t want the athlete muscling down the track. <br><br>In addition to using the sled to improve acceleration, Greco uses it with extremely heavy weights to develop strength, as a supplement to regular weight training. However, technique is also important when using the sled for this purpose.  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), ople respect you when you take a firm stand. People would say, 'Col. That's good.' I have never seen anything good come out of it. It doesn't make you rich or healthy.&nbsp;</P> <P>"I believe in being a good Christian. The spiritual area of life is the most important part of life. You can have your football and school but you need to have the spiritual side of life to make those things truly meaningful."&nbsp;</P> <P>We thank David for being an Upper Limit person and for being such a wonderful example. We thank Jim Brown for getting him started on the right path in strength and conditioning and all the other teachers and coaches who played a role in his development. We thank Mr. and Mrs. Paul Webber for helping us with this article and raising such a fine son. We wish David the very best in this next important stage of his life a