The Houston native, 25, gets his big break—ouch!—in the mixed martial arts film.

HOW DID YOU GET IN SHAPE FOR THE FILM? We trained for about six hours a day, six days a week. I gained 15 lbs. of lean muscle and ate, like, a duffel bag of food a day to gain weight.

ANY INJURIES? I got body-slammed and broke one of the bones in my back. It's like breaking a rib. All you can do is take painkillers and wear a brace.

WHAT DOES YOUR FAMILY THINK OF YOUR FIGHT SCENES? Grandma's cool as a mule. She'll say, "I closed my eyes during those parts, darlin'—don't you worry."