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What did people call displays of muscles prior to the existence of guns? I imagine body fat was higher, and precise exercise was rarer, so muscles were less pronounced.  People likely just looked bigger without the definition and showiness of body builders. The art of barbarians and warriors in D&D books and on the covers of fantasy books is likely as impractical and unlikely as the perfectly toned bodies of superheroes. They’d more likely resemble “Thor” Björnsson who is a big, big dude, but doesn’t have the extreme definition where you can see the arc and curve of every muscle. That’s assuming adventurers living on rations could even keep up the caloric intake needed to maintain a body like that.