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If true, it's probably because humans have mostly slow twitch muscle fibers (e.g., great for endurance and manual dexterity) while great apes are mostly fast twitch muscle fibers (good for raw strength). That's why a chimpanzee, who is much smaller than a person, can perform feats pf strength that would embarrass most strong-man competitors. OTOH, humans evolved to run; the kind of long-distance running that some people do for fun would kill other primates.
Well, the kind of long distance running that some people do for fun would definitely kill me
Especially long distance running. Imagine a gazelle in prehistoric Africa running away from this weird ape until it is completely exhausted, just to turn around and see the weird ape still coming after it in the distance. We were the horror villains of prehistoric animals.