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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?

you run on the track and sometimes on the street and/or road

Will your legs get faster if you run 1 mile a day?


How do you run 400meters without having your legs tighten up at the last 100m of the race?

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.

How many feet will a person run during a five mile race?

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

What races do quarter horses run?

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

How do athlethes run a relay race?

with there legs.. how else would they?

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.

If run 1760 feet in a race what part of a mile is this?

1 mile = 5280 feet1760 ÷ 5280 = .3333333 or 1/3 of a mile

How much fuel does a top fuel drag racer burn?

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.

How much fat will I burn on a treadmill if I walk, compared to run?

You burn about the same amount of weight per mile moved, regardless of whether you run or walk. The difference is in how long it takes you to move that mile. The faster you walk, the more you will burn per hour.

Who invented the mile race?

There is no one person credited for creating the mile race. Track and field has been around sense roman times where men would run to see who was the fastest in rome. The mile race simply came after time.