one factor is neuromuscular efficiency. You can have big muscles but lack the neural connections to activate them effectively. Have you even been unable to do an exercise or lift a certain weight but then after trying for a couple of days you can? You didn’t suddenly grow enough muscle to do the exercise. muscle takes time to build. Your brain just rewired to recruit your existing muscle more effectively.
Athletes typically have very good neuromuscular efficiency. they can fire a large percentage of their muscles cells at the same time.
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