Nick Jonas Is Shirtless Again. You’re Welcome

Nick says he "got pretty Hulk-ish" during filming.

"I was doing three sessions a day: one fight-training with Kingdom's coach, Joe 'Daddy' Stevenson, and two strength-building with [trainer] Gregg Miele," the star explained. "Each workout focused on a different region of the body -- upper body, core, or legs -- and we'd do a circuit of six different moves for one area. Lifting a lot of weights, really trying to break the muscles down."

Now homeboy cut back to 2,500 calories per day and three or four workouts per week.

"I'm not the kind of person who wakes up in the morning and can't wait to work out," he admitted. "I kind of dread it, actually. I see it as a necessary evil."

See the sexy snaps here: