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There's generally two types of muscle fibers: fast-twitch and slow-twitch. One of the things that is a hallmark of aging is a reflective reduction in fast-twitch
fibers.
Andy Galpin
Endurance Training Without Lifting Weights Increases Quad Slow-Twitch Muscle Fiber Density
GUEST SERIES | Dr. Andy Galpin: How to Assess & Improve All Aspects of Your Fitness
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