Lactic acid buildup: it was makes muscles sore. Usually if you are sore it means that you injured muscles enough that they need to repair the micro-injury you caused. That is what makes them bigger over time so it's sort of a good barometer of working out right
Answered 7/6/2015
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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