In the world of wuxia lore, martial artists train to be able to attain that feat. In the world of Final Fantasy (or just plain video game) lore, it's all about fighting battles. You don't have to necissarily think of it in terms of levels. But either way, the more battles you fight, the more powerful you get and more abilities you attain. I'm going to cite DBZ as an example of this, for anime reference. Rarely do the characters actually train to highten their martial arts abilities. What they do is put a lot of physical stress on their body. Doing bogus kicks and punches in 10x Gravity isn't going to make your reflexes any better in a fight. But that's how they get "more powerful". Its the way reality works in DBZ. In FF, the same thing is done, but the physical stress is attained through countless battles that we aren't privy to in the movie (it's all in the game). In either case, there is no mental discipline, yet they attain super human abilities. So they can do moves that wuxia does, but they don't get there the way wuxia does