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What types of muscle fibers do I have?
Find out if you have more slow- or fast-twitch fibers
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There are two different types of muscle fibers in your muscles. Fast twitch and slow twitch. All muscles in your body are comprised of a mixture of these two types, but the percentage of each fiber varies from muscle to muscle, and between people. The proportion of different muscle fiber types affects what kinds of physical work a muscle or person is good at. The types of fibers you have in your muscles is largely dependent on your genes.