Mixed martial arts is an intense profession. But that intensity is a profession unto itself. An art, if I may be so bold.
It's not something you take for granted. It comes with time. You work at it. You scream at strangers in the grocery store. You get into staring contests with cathedral gargoyles. You spend hours in front of the mirror, craning your neck tendons over and over, until you finally have the perfect crane. Those tendons need to protuberate, and they don't protuberate themselves.
These are MMA's 10 great wizards of the weigh-in. Intensity ain't easy, but these fighters make it look so.
Heroes? You be the judge. But yes, they are.