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It's a build up of lactic acid. The muscles cannot process the waste products (from rapid exercising) quickly enough, and this builds up in the tissues as lactic acid. Eventually the levels get so high that the muscles seize-up.

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7y ago
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7y ago

The burn is caused by the build-up of lactic acid in the muscles.

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Q: Why do your legs burn when you run a 3 mile race?
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Related questions

Fastest ten mile race run?

As of October 2014 the fasted ten mile race was run by Haile Gebrselassie. The race was run in only 44 minutes and 24 seconds.


What do you run on when you run a half mile race?

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Jogging it. But to run a good and efficient race your legs will have acid no matter what. So you will need to train harder to get your legs use to it.


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They will run 26,400 feet. (there are 5,280 feet in one mile).


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How do athlethes run a relay race?

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What is a mile split?

A 'split' is the time it takes to run a portion of the race. Split times in the mile run are generally taken after 1/4 mile, 1/2 mile, and 3/4 mile and are used to determine whether the runner is on pace to finish the race in the desired time or in a record time.


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A top fuel drag racer can burn between 15-20 gallons of fuel during a single quarter-mile run. These vehicles are extremely powerful and use a specially formulated nitromethane-based fuel that burns quickly to generate high horsepower.


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Who invented the mile race?

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