Sprint Sled Planning & Implementation Guidelines 

This video provides a quick explanation of how to plan and implement resisted sprint training using a dragging sled or similar tool. I have always treated the sprint sled as a means of controlling acceleration posture and teaching an athlete how to maintain a proper body angle during the early portion of a sprint effort.
The weight of the sled should be heavy enough to allow an athlete to achieve a more pronounced acceleration angle without slowing them down too much. Typically, this is approximately 10-15% of body weight, although it can vary by type of sled or the coefficient of friction of your running surface. Make sure to time sprints and monitor running mechanics to ensure the proper weight is selected.
Heavy sleds are attractive to people, but make sure to limit them to shorter distances. If you're using a push sled, you can always break away from the sled and continue your sprint unresisted.
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