Nick Jonas Shirtless Once Again and Throwing Punches for Details Magazine

Nick Jonas For Flaunt
Nick Jonas grabs ahold for Flaunt magazine.
Luckily for us, Nick Jonas isn’t too worried about taking his close off these days. First there were the photos from Flaunt, and now these sexy pics that accompanied a feature in Details magazine.

The hunky singer and actor talked about how he bulked up for his role as a MMA fighter on the DirecTV series Kingdom.

“I had about six weeks to put on 12 to 15 pounds of muscle before filming started on [DirecTV’s] Kingdom—my character is a fighter whose strong suits are wrestling and grappling. Diet had a lot to do with it. I went from consuming about 3,000 calories a day to 4,200!

He went on, “I don’t have the luxury of eating whatever I want whenever I want anyway, because of my type 1 diabetes, so I have been conscientious about food for a long time. I do have guilty pleasures, though. I wasn’t drinking at all while I was training for the show, but now that we’re done, I keep it classy with Coors Light.”

“If I’ve had an indulgent night, I try to make up for it as soon as possible the next day. First thing I do if I’m in Los Angeles is go to Voda Spa and sit in the steam room, sauna, all of it—try to sweat out as much as I can. Then I’ll go work it out.

That takes such discipline and dedication. He has let things go a bit since he’s gone on tour:

“I got pretty Hulk-ish. Now that I’m on tour for my album, I’ve leaned out about 10 pounds from what I’d gained. It’s been fun to change my physicality. My meal plan came down to about 2,500 calories, and the portions got really small. I exercise only three or four times a week.”

Launch the gallery to see more of Nick working out, and then make sure to visit Details.com for more pics and more on his workout routine.