Responses
I think the same way. The guy can exert 5 times the strength of the normal guy ffs. that alone put him on the realm of superhumans (￣∇￣")
But not gonna be picky here, I guess it can be explained with innate skills adventurers have which, when trained even half as he trains himself, can make all his build meaningless.
I mean look at his build, he's basically a titain. Can't he be like a tank or something? I don't understand? If he had a shield and sword he could take damage while the others attack the enemies. If he can't use a sword then use a spear, or if you can't use either use a battle axe it something.