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    Pain & Gain: Mark Wahlberg & Dwayne Johnson Talk Bulking Up For Action Movie

    Mark Wahlberg and Dwayne Johnson had to kick their fitness up a notch for the upcoming bodybuilding movie, "Pain & Gain."

    While both stars amped up their physiques for the Michael Bay-directed flick, Mark said he had to work hard.

    "I had a huge preparation," Mark told Access Hollywood at the "Pain & Gain" premiere in Miami on Thursday. "And then also just letting loose, becoming this character. I was always fascinated with the world of bodybuilding."

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    Mark's kids were divided on their dad's new look.

    "My daughters didn't like it. My sons absolutely loved it," he said.

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    Mark's ripped bod will come in handy for his next film (also with Michael Bay), "Transformers 4."

    "We start [filming] in a couple of weeks," he said. "I'm ready to go."

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    As for Dwayne, "The Rock" didn't have to undergo as much of a physical transformation for the film.

    "I was really fortunate because I was coming off of 'G.I. Joe,' I was coming off of 'Fast & Furious' at that time too," he explained, referencing his recent films. "So a lot of those projects supported and fostered the type of training I was doing."

    Adding, "The biggest thing with a movie like this -- the biggest departure was the vulnerability and showing this type of vulnerability, and playing a character who is easily influenced and who's just out of prison and looking for salvation."

    "Pain & Gain" hits theaters on April 26.

    -- Erin O'Sullivan

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