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Dwayne Johnson underwent an extensive physical and mental transformation to portray MMA fighter Mark Kerr in "The Smashing Machine." The film, releasing Friday, required hours of prosthetics, voice coaching, and a significant weight gain for Johnson, who trained intensely for the role. Kerr's son provided the ultimate validation, stating Johnson not only looked and sounded like his father but also captured his 'heart,' deeply moving the former fighter.

Prepared by Emily Rhodes and reviewed by editorial team.