Pattinson, who plays vampire Edward Cullen in the movies, and Spencer, who plays werewolf Sam Uley in the New Moon film, had a rowing race on the set of New Moon in the weight room that was needed to keep all the actors in shape for the film.
"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," the Daily Star quoted Spencer as saying.
"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," he added.