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The Anaerobic System
Sugar (glucose) is converted to energy in the anaerobic muscles. These are sometimes called fast-twitch or white muscle fibers. They are used for short-term power (such as weight lifting) and sprint speed (such as an all-out 100 meter race). These attributes are used very little in endurance sports. Anaerobic energy is also very limited—relying only on this system won’t even allow a 5K race to be completed.
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