re: “Grown Man Strength “

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It’s not muscle memory that produces strength, it’s muscle maturity.
It takes years to fully mature a muscle for it to reach its peak abilities.

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to do with neuromuscular control, or the ability for the brain to tell the muscles to work together efficiently. “As you age, neuromuscular control improves up to age about age 55,” says Brandon Roberts, M.S., C.S.C.S., a doctoral student of muscle biology at University of Florida. “At this point, the receptors required to activate muscle also start to decline.” Take Roberts’ example of a son, 20, losing to his 45-year-old father in arm wrestling. “The father has been working out for 20+ years and therefore has developed better control of activating his muscles at various force outputs,” Roberts explains. “The son also works out but has only been exercising for a few years, and his testosterone levels are technically higher, but that doesn’t play a big role in the ability to control muscle.”

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