What is lactic acid? | Live science

What is lactic acid? If you’ve ever tried to sprint as fast as you can at the end of a race or do a set of heavy squats at the gym, you’ve probably experienced an unpleasant burning sensation and extreme fatigue in your legs.

For many years, exercise scientists attributed this muscle burn to lactic acid, which was thought to be a by-product of the metabolic reactions that take place in your muscles to generate the energy they need to fuel your heavy workout.

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