Mark Wahlberg graced the cover of Men’s Health, where he admits he’s obsessed with fitness. But now that he’s getting older, working out takes on new rules, especially when he’s going in for new roles.

“I don’t play basketball anymore because I don’t want to roll an ankle and miss a movie or screw up my golf game,” he said. “I’m doing [the Versaclimber, a machine similar to a stairclimber] twice a day and jumping rope. If I wake up at 3:30, I can go to the golf course at 6:30, be done by 8:30, and then be home and then do the rest of my stuff: work with a physiotherapist, get treatment, hit the cryo chamber.”

He’s also prepping for his upcoming movie, Mile 22, a CIA thriller. “I’ve been fat in all of Peter [Berg’s] movies,” Wahlberg says. “For this one I’m going to be down to 6 percent body fat.”

“The only way to be the best is to keep working like you got nothing,” he says. “Keep getting after it, and be more and more aggressive, more and more focused every day. I don’t know. I have more drive and desire now than I ever have.”

Read more at Men’s Health.