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When you exercise to the point where you cannot inspire oxygen fast enough to deliver oxygen to your cells, your body starts creating energy (in the form of ATP) by anaerobic respiration as opposed to aerobic respiration. A by-product of anaerobic respiration is lactic acid, which causes pain to muscles. Over time the 'oxygen debt' is repayed and the lactic acid and the pain will go away.

Some of the pain may also be attributed to the small tears that occur in muscles after a hard work out (this is natural), and will also go away as the muscles rebuild.

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14y ago

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