Dwayne Johnson is opening up about his transformation in the upcoming A24 film The Smashing Machine.

Johnson portrays mixed martial artist and UFC fighter Mark Kerr in the movie, and he wore a wig and put on 30 pounds for the lead role.

“For me, the transformation was 22 prosthetics, over 30 pounds that I had to put on, which is a lot of weight,” Johnson said in an interview on Good Morning America Thursday.

Alongside his physical transformation, Johnson had to flex his acting chops and said he spent a significant amount of time getting to know the real-life Kerr.

“No one can really relate to what it’s like to be the greatest fighter on the planet. At one time, Mark Kerr was the greatest fighter on the planet and undefeated, dominant, and feared. But we can all relate to pressure, what

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