Does increasing muscle fibers make your arms bigger?


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Muscle Your muscles are composed of slow twitch fibers and fast twitch fibers. Slow twitch fibers are used in light endurance activities to develop and strengthen muscle fibers, while fast twitch fibers are typically used in fast-paced or high-impact activities, such as sprinting or power lifting, to develop muscle fibers and increase muscle mass. Thank you for using ChaCha!

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