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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So when the muscles fibres are exerted they experience a phenomena called microtearing, where the fibres actually become damaged. In severe cases, significant tearing causes a lot of pain and discomfort, but in repeated low doses (exercise), Microtearing actually promotes blood flow and muscle fibre building in the affected area, as the body attempts to repair the damage and then some. This is how you build muscle and why different people should work out different depending on their existing level of fitness
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