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If you were just recovering from Nick Jonas' last shirtless (and pantless) photo shoot, brace yourself. Nick is back without his shirt, this time for Details magazine in another sexy photo shoot!

Obviously someone's been hitting the gym! And that's what Nick's Details feature article is about. Jonas shares the details about how he got his amazing beach body, and bulking up for DirecTV's "Kingdom."

Tetsu Kuboto/Details Magazine

Nick tells Details, "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!"

Hey Nick, which way is the gym?

Tetsu Kuboto/Details Magazine

All we have to say is, Olivia Culpo is one lucky lady! That's enough to make ANYONE jealous.