In order to get in superhero shape for “The Wolverine,” Hugh Jackman turned to someone who knows how to build a super body – Dwayne Johnson, aka The Rock.

Hugh had, of course, built up his body for the last Wolverine film and various “X-Men” films, but this time around he was about to head into “Les Miserables,” a film that required him to drop a considerable amount of weight. Knowing he had to do the two projects – “Les Miserables” and “The Wolverine” — back to back, Hugh knew he needed The Rock

“I called him actually before I did ‘Les Mis’ because I was like, ‘Man, I have a feeling this is going on. I have to cut down and really lean down in size,’ and he told me a number of things,” Hugh recounted when Access Hollywood sat down with the actor at the junket for “The Wolverine,” in New York City on Thursday. “First of all, he said, ‘When you’re lean-ing down, still keep your strength. You can still go in and push weights, so that as soon as you start eating again you’ll go back quickly’. But, he said, ‘You gotta eat 6,000 calories a day, you’ve gotta train three hours.’”

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Those 6,000 calories were not the fun kind – like burgers and milkshakes, Hugh told Access.

“It’s chicken breast and vegetables,” he said. “Six thousand calories a day could be a pizza and a nachos, but unfortunately it’s a lot [of chicken] and fish. I’m going to some kind of chicken hell at the end of this. I’ve literally murdered nations of chickens. Yes, I’m not the poster boy for the vegan movement, but it’s that and training hard and time.”

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The two exchanged calls during the process, and there was one moment on a phone call that Hugh still gets a kick out of.

“One of the coolest moments when I was speaking to him — he was on a movie at the time — and in the background someone knocked on his trailer door and he goes, ‘Hang on a second!’ He opens it up, he goes, ‘I’m talking to Wolverine, you tell them on set they can wait,’” Hugh laughed.

— Jolie Lash