Nick Jonas has one of the most admired (and desired) bodies in Hollywood, so what exactly is his workout regimen?

Jonas has put a lot of concentration into his health over the past few years, and his body has shown that work. Jay Glazer, the founder of Los Angeles' Unbreakable Performance Center (where the singer trains extensively every week), spoke with People recently about Jonas' training.

"His workout is bodybuilder-based, so we'll take one or two body parts and crush those per day instead of doing total body," Glazer said. "He works out his arms, his shoulders, his chest, his abs and his legs."

Jonas likes to focus on arms in his workouts, as Glazer explained, "We'll burn his arms out to where he can barely move them, but we recover him fast so he can get back."

The "Chained" singer works out Monday, Tuesday, Thursday and Friday, does active recovery on Wednesday and Saturday and rests on Sunday.

"We use bands, med balls, physioballs, machines," Glazer explained. "We pinpoint every area of your abs, and do a minute, 15 seconds of four to eight different exercises."

One exercise Jonas does not focus on is crunches, and for a very specific reason.

"We barely do crunches," Glazer said. "When people do just crunches, not only can it cause lower back issues, but it also doesn't activate everything."

Jonas also does some boxing and MMA training after working out. "For people who want to bulk, the performance program is slower with heavier weights, and then we'll box them like crazy to shred them up," Glazer said.

As for his diet, Jonas was diagnosed with type 1 diabetes at the age of 13 and with his diet being restricted, he focuses on a high-protein diet.

"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," Jonas told GQ in 2014. "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."

Tags: Nick Jonas diet fitness