Before sharing his regimen in preparation for shirt-off scenes, Hugh Jackman once offered this sage advice: “Don’t do this at home.”

A three-month intense training run-up finishes up with induced dehydration, Jackman, who played the Marvel Comics superhero Wolverine, told The Late Show host Stephen Colbert several years ago.

First, “you increase your water intake to, like — I’m trying to think what the gallons is — but you have about 10 litres of water, which is, what? Three gallons of water a day?”

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“And then you stop about 36 hours before you shoot,” Jackman said. “But, because you’ve drunk so much water, you are peeing, all the time.”

Other movie stars have spoken out about what it takes to achieve their muscly looks, includ

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