you can either gain fitness through heavy lifting to gain muscle, which involves growing new muscle cells, aka hypertrophy, or you can get fit through endurance exercise, which involves the cells you have gaining additional mitochondria, and the ability to process more oxygen and deliver more ATP at once.
You won’t neccesarily get bigger, but you get stronger and more fit. (some people would call this “Farmer strength”) but you also won’t burn out nearly as quickly as someone who focuses purely on size.
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