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Muscle Fibers 101 & Goal-specific Training
Our bodies are composed of three types of skeletal muscle fibers: (1) Type I: slow-twitch, high endurance capacity; (2) Type IIa: fast-twitch, large, powerful, medium endurance capacity; and (3) Type IIb: fast-twitch, large, powerful, and easy-to-fatigue (sometimes called fight-or-flight muscle fibers). Your muscle fiber composition ratio is dependent on a muscle’s function, your age, your genetics, and – something you…