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Actress Hilary Swank famously got into rip-roaring red-carpet shape while heavily training for her role as a female boxer in 2004's box-office hit Million Dollar Baby. At the time, Swank told a magazine that she put on nearly 20 pounds of muscle for the role of Maggie Fitzgerald by stepping into the ring for more than 4 hours a day and eating a whopping 4,000 calories per day.
From former WWF darling Stacy Keibler to boxing buff Mark Wahlberg
9 Celebrities Who Got Fit Fighting