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You know him as Dr. Jack Shephard on TV’s Lost, but we guarantee you’ve never seen him looking like this before. Actor Matthew Fox trained to near throw-up stage to get the bod of his character Picasso—a psychotically fit serial killer—in fall’s new hit movie Alex Cross.

Fox cranked out circuits non-stop for 80-90 minutes a day to look just right—shredded, but far from a gym rat. His circuits included a bunch of full body exercises, and he lost close to 40 lbs. We went behind the scenes of Men’s Fitness cover photo shoot to ask Fox for a rundown of just how badass his training program was. Check out the video, and then flip through the November issue of Men’s Fitness where the 46-year-old sets the record straight about his life, both on- and off-camera.