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As if the acting part isn't stressful enough, certain stars are asked to look a specific way for a film. Heck, one shirtless scene in Top Gun: Maverick, Miles Teller had to undergo quite the process behind the scenes.The same goes for Zac Efron during Baywatch - the diet and training was so hard that the actor vowed never to look that way again!RELATED - The Real Way Joaquin Phoenix Lost 50-Pounds For His Role As The JokerWhen looking back on iconic physiques, Hugh Jackman in Wolverine will always be remembered. Although his days in the role might be over with, we'll take a look back at everything that went into brining that vision to life on the big-screen.

The Diet Part Turned Out To Be The Most Crucial Component For Hugh Jackman's Wolverine Transformation

There truly was a lot of pressure on Hugh Jackman during his Wolverine prep. Looking back, it is safe to say that it all worked out quite well, given that his physique in the film was major goals for millions of fans.

Speaking alongside the LA Times back in 2014, the actor revealed that the journey was not the easiest. Sure, working out was a big part of it, however, nutrition was even more key for the actor to pull off such a transformation.

"It’s too hard to get in shape from scratch, and it’s easier to stay in shape than to get in shape. ... For Wolverine I really up the training."

"Foodwise I eat more, but I eat a lot stricter. Seventy percent of your physique is your diet, and diet is the biggest change that happens."

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Keeping in shape is just a small part of it, as Jackman puts a focus on being functionally fit as well, especially for the sake of the film.

"It’s absolutely physically demanding to play the role of Wolverine. There’s a lot of action, and I try to do as much of it as I can because it’s better for the audience. You don’t just have to look physically in shape; you really have to be mobile and be able to fight and jump and do wire work and stuff like that. The training has to be functional."

In order to achieve this look and level, it took a lot of hours in the gym...

Hugh Jackman's Workouts Weren't Easy And Normally Lasted Two And A Half Hours

Yup, Hugh Jackman trained for 150-minutes per day on the road to portraying Wolverine, "I do about an hour of training a day and ride my bike everywhere. But I do about 2 1/2 hours of training a day when getting ready for the role."

What did the training entail? Well, according to the actor, it seemed to be a bodybuilding approach alongside his coach. In addition, cardio was still at a very high level throughout the prep.

"I do heavy weights in the morning for about an hour, and then I do 45 minutes of higher-volume lifting in the afternoon."

"I do quite a few chin-ups and rows. I do mostly old-school lifting with a lot of squats. I actually do more front squats than I do back squats, and I do a lot of deadlifting."

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In terms of cardio, Jackman stated that being a parent is more than enough, however, he also did a lot of bike work as well when prepping for Wolverine.

Hugh Jackman's Logan Prep Caused The Actor To Lose 10-Pounds Of Water Weight Before His Shirtless Scene

There is a certain type of bro-science when it comes to filming shirtless scenes. It involves extreme water manipulation, as Jackman revealed alongside Stephen Colbert.

Hugh discussed the process, which features a heavy water loading phase, which is later converted into almost no water. The dehydration usually lasts a bit more than a day, and it makes his physique dry and aesthetic looking. For Logan, the actor lost 10-pounds of water thanks to the process.

"I find out the date which is the shirt off thing, and it's about a three-month runup," said Jackman. "You gotta be in pretty good shape, but the three months before is very specific."

"You increase your water intake ... you have about 10 liters of water, which is, what is that, three gallons of water a day," says Jackman. "Then you stop about 36 hours before you shoot, but because you've drunk [sic] so much water you are peeing all the time."

Quite the journey, though it is one that fans won't forget.