Mark Wahlberg Reveals his 'Pain & Gain' Prep for Movie Roles

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Mark Wahlberg stopped by "Jimmy Kimmel Live" Tuesday night to promote his upcoming flick "Pain and Gain," which is about a pair of steroid-abusing Floridian bodybuilders who get caught up in an extortion and kidnapping scheme. With four films in the last year, the hunky Hollywood A-lister had to endure quite a crazy lifestyle in order to lose and gain weight quickly for each role.

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