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There are basically two types of muscle fibers: Slow Twitch and Fast Twitch or respectively Type I and Type II, which has can be subdivided into a whole spectrum of fibers starting with Type II a. Since exercise converts Type II subtypes into "a" by increasing mitachondria among other things, there is little sense in keeping track of the distinctions. Fast Twitch muscles correspond in color to dark turkey meat because they have far more mitachondria than Type II[1].

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