Topical Terminology > Fast Twitch Muscle Fibers
Fast Twitch Muscle Fibers
For Fast Twitch Muscle Fibers we have a term and definition in Fitness.
Fast Twitch Muscle Fibers (Fitness) 
Muscle fibers that contract quickly and powerfully. They are utilized in anaerobic activities like sprinting and powerlifting. Fast Twitch fibers are developed by heavy, low rep, explosive weight training. Everyone is born with different ratios of fast to slow twitch muscle fibers. It has been proven that working out does changes fiber behavior and helps grow new fibers.
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