The size of a person's muscle fibers and the efficiency with which nerves can activate those fibers are the two primary factors that influence muscle strength.
The male sex hormone testosterone is probably the most well-known of these. Both muscle protein synthesis and breakdown are regulated by testosterone. If you have a lot of testosterone, you probably also have less fat and more muscle and strength.
This is because our genetic inheritance has different effects on everything from body shape and bone structure to weight and muscle mass. Simply put, some bodies are predisposed genetically to gain muscle more quickly than others.
Learn more about muscle fibers here:
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