There's a rule that says that a given bodybuilder is no stronger, and very often less strong, than a given athlete of any other kind, which is probably a pretty a pretty big generalization. And since people usually go overboard with generalizations, there's probably also the idea of them being just plain weak. I've said this several times, but look at all those comedies and dramas where an "Everyman" (or woman) beats up the bully with the bodybuilder look. So it's ALMOST surprising that Peplum films decided to do that kind of casting. Sure, Steve Reeves has that general look that everyone mentions, but he was followed by so many other bodybuilders. It's almost easy to imagine the Peplum films casting actors with that Keving Sorbo look instead.