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# Why do your legs burn when you run a 3 mile race?

Updated: 9/27/2023

Wiki User

11y ago

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.

Wiki User

7y ago

Wiki User

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

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They are most famous for the Quarter-mile race, the race they get their name from.

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