The 53-year-old, who plays an MMA fighter battling opioid addiction, has been garnering Oscar buzz for the drama, based on the life of Mark Kerr. But it was his slimmed-down physique that really got people talking. Known for his bulging muscles and epic "cheat day" meals, Johnson has shed an estimated 60 pounds from his 6-foot-5 frame. An insider told RadarOnline.com the action hero deliberately changed his workouts and diet to achieve a less ripped look. "He's a total pro who knows his body inside and out."