The Brit, who plays vampire Edward Cullen in the movies, put his fitness to the test in the weight room on the set of the new Twilight film New Moon - and staged a rowing war with co-star Chaske Spencer.
The movie werewolf explains, "We were all really competitive and supportive of one another. One time, I had the highest score on this rowing machine and the next day I came in and Rob had beaten me.
"He worked out at night, and the wolves came in during the day. I'd beat him and then he'd beat me. On the last day of shooting, I came in and he’d beaten me by a second."