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Understanding the Types of Muscle Fibers and Their Genetic Potential
Type 1 muscle fibers are slow twitch, type 2a are pure fast twitch, and type 2x are even faster than type 2a/nType 2x fibers are significantly faster than type 1 and type 2a fibers, but also result in a significant drop in endurance/nAlthough humans have the genetic potential for type 2x fibers, they are extremely rare