But who has he enlisted for help in achieving that rock-solid physique? Why, none other than The Rock.
"I got the diet from Dwayne Johnson, he put on 25 pounds for his last film and I saw him and was like, 'wow' so I called him up and he gave me his exact diet," Jackman told FOX411's Pop Tarts at the Audi Super Bowl celebration at the Audi Forum in Dallas on Friday evening. "I need to put on about 30-40 pounds, I don't know if I can get there but I am up about 15 pounds so far. I'm trying."
Jackman's Johnson-inspired weight gain diet is comprised of 6,000 calories daily, and believe it or not, but its "hard work" to eat so much.
"Basically it's steak or chicken, broccoli and cauliflower, and sometimes rice but only up until lunch time," he explained. "That's it eight times per day. It's like a job in itself."
"Have fun, enjoy the first hour because it's the best audience you'll ever have and from then on there is a lot of seat fillers and people that are really tired and probably upset they didn't win," he said. "So just keep the show moving."
And even though the Australian native grew up playing his homeland's beloved form of football -- rugby -- he's happily converted to U.S style.
"It took me a little while to get into, because I was used to rugby and played rugby," Jackman confessed. "But I love that in every game there is great pressure and suspense. With rugby and Aussie Rules (another form of Australian football) it is just flowing all the time, but American Football is so full of suspense. I just love it. And the athletiscm, these guys are freaks. I love it."