by Claudine Zap In the upcoming movie " Twilight Saga: Eclipse ," Kristen Stewart 's character must choose between Taylor Lautner and Robert Pattinson . But if it was a war of workouts, Mr. Lautner would win every time. The young actor and breakout star has turned werewolves into the sexiest, muscular men since Arnold Schwarzenegger in " Pumping Iron ." Just add fangs. And don't get us started on those abs: The guy's mid-section has become more famous than he is. Lately,