what is that “burn” you feel while exercising a muscle, and why is it necessary to feel that burn to build muscle?

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what is that “burn” you feel while exercising a muscle, and why is it necessary to feel that burn to build muscle?

In: Biology

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I believe it’s lactic acid that causes the burn. Essentially tearing down muscles, so that your body “heals” them by regrowing more muscle tissue to cover up the “scar”.