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Not all resisted sprints are the same. Hill sprints create a natural horizontal resistance that teaches projection and front side mechanics. Chains and sleds overload horizontal force production, improving early acceleration. Resisted sprint devices let you dial in precise
loads using velocity decrement or % of bodyweight. Bands or towels add reactive tension but are harder to quantify, best for low-load accelerations or partner drills. In Speed Kills, I break down how to actually use resisted sprinting, how to choose loading based on %
bodyweight, how to apply velocity decrement, and how to progress from hills to sleds to free sprints. It also includes an eight-week speed program built around the same methods I use with my athletes. <a target="_blank" href="https://fredduncantraining.com/product/speed-kills/" color="blue">fredduncantraining.com/product/speed-ā¦</a>