Even if fighting is not your thing, I would urge you to watch the film and read or listen to what Norman says:
"Fighting chose me."
"It's within me."
I doubt, very much, that any of us would want to climb into a MMA ring, but when you are drawn to something, like fighting, it's hard to see how anyone would do it just for the money, glory or fame.
If only more of us would pursue our passion, whatever that is, in the same way.