![]() ![]() All human muscles are made of a mix of slow- and fast-twitch fibers-as well as some that are undifferentiated, and will become slow- or fast-twitch depending on how we use them most often. ![]() But Bolt comes close-thanks to a combination of having all the advantages of a natural-born sprinter and putting in the effort needed to minimize any of his disadvantages.īroadly speaking, Bolt has the unique muscular build shared by most of the very best sprinters. There’s no such thing as a perfect human running machine.
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