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Anonymous
>>290601 You are born with slow twitch muscle fibers, and fast twitch muscle fibers, a set amount and the number of muscle fibers you have don't increase. You don't gain more or less throughout a life time(unless you lose a limb) They just get smaller or larger. Doing push-ups or anything won't "give you" slow twitch muscles, it will simply cause your muscle fibers whether they're slow or fast twitch muscle fibers to grow at a slower rate with out an increase in difficulty.
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