is it just more cells being made? how does one’s bicep for example go from like, a flabby twig, to something shapely and hard and strong? i sort of have a basic understanding about lactic acid and how that makes muscles sore after a work out but how do they get bigger?
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Very basically, when you work out, you are making small tears between the cells of the muscles. After time, the muscles reproduce through mitosis in order to repair the tear, filling the gaps of where the muscle was torn. This leads to more muscle cells than before and is also the reason why rest is so important to getting gains.
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