Remathilis
Legend
By build up you better mean "reveal his Kryptonian heritage".We can start at the former and build up to the latter.
That's why this debate never goes anywhere. Because people say they want mundane heroes and then want them doing 10 impossible things before breakfast. But don't call it magic. Don't even say it's supernatural. Fighters just train and make gravity a suggestion because they want it to.
It. Doesn't. Work. Like. That
Either fighters are mundane and nonmagical creatures and are limited by that OR they are magical beings and all bets are off.
This really reveals the folly of trying to cram John McCain and Hercules in the same class. They don't flow from one to another. So pick which one you want.