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Slow twitch fibers Slow-twitch fibers are muscle fibers that are used more when compared to the rest. Your legs are full of slow-twitch fiber because you are on your feet much of the time. Another name given for slow-twitch fiber is endurance fiber because they have been forced to adapt via being used so frequently and that is why it is harder for them to grow.

Fast Twitch Fibers Fast-twitch fibers are then obviously easier to grow because they are used less. When you are working out it is like they are being challenged for the first time. That is the reason why people see the most gains with these muscles when they first start working out.

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16y ago

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