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Do you mean for example after running for a while?

Generally, after you have been exercising at a moderate to high intensity for a while your body begins to work anaerobically to provide the energy, which means it doesn't use oxygen. This causes lactic acid to build up in the muscles which causes fatigue. You will find that after intense exercise you will be breathing heavily. This is because the body is trying to repay the oxygen debt by working aerobically (using oxygen) again, and the oxygen helps to break down the lactic acid that had built up in the muscles. This is why it is important to do a light aerobic cool down after exercise, otherwise your legs will probably still be sore from the lactic acid the next day.

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15y ago

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