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when you exersize muscle are using up the sugar from your body but theres a time when you get tired and you have to stop so that means no more sugar to burn muscles are releasing carbon dioxide, water, and energy. OR, your either not getting enough oxegyn. Muscles start to produce acid/toxic that's acid is lactic acid . the acis is keeping you away from having any energy to keep on continuing what you are doing so ...

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14y ago

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