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During strenuous exercise, lactic acid or 2-hydroxypropanoic acid is formed. Lactic acid buildup occurs during strenuous exercise, the body is incapable of removing the waste product from the muscle tissue. When lactic acid buildups it creates a burning sensation, however over recent years and studies, scientists have been doing more research on the acid and believe that is actually doesn't cause or increase muscle soreness but rather is an important fuel source for active muscles. But, more research is needed in this particular field for more definitive proof and information to be discovered.

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