The fear that heavy lifting will turn a fast athlete into a slow one is one of the most persistent myths we deal with. It comes from confusing bodybuilding-style training (high reps, slow tempo, isolated movements) with athletic strength work. Lift heavy with intent to move fast, and your speed goes up, not down.
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The myth most likely comes from athletes who lift in a bodybuilding style (high reps, slow tempo, isolated muscles and movements) who then gain excessive amounts of extra slow twitch muscle mass.Athletes should instead focus on lifting for neural adaptation. Heavy weights, high intent to move and lower volumes of work. For all things speed training head over to our playlist on YouTube