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there actually called fast twitch fibres and slow twitch fibres ! and fast twitch fibres are in your muscles and they determine if your going to be fast at a certain thing or the slow twitch fibres...
Fast twitch muscle fibres are ones used for sudden bursts of physical activity, such as sprinting or weight lifting. Slow twitch muscle fibres meanwhile are designed for extended periods of...
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...
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