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well they are all less than a mile which means that over 50% of the race is run in the anaerobic phase. where as the mile or 1600m is about 54% aerobic. anaerobic is when the muscles lack enough oxygen for the work being preformed and must break down lactic acid in order to continue. a human can preform pure anaerobic work for about 45 seconds

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12y ago

What else can I help you with?