When it comes to keeping his hard-earned bod in tip-top shape – to fight the Volturi, obviously – the Emmett Cullen actor gets a push from his ever-active four-legged trainers: shepherd-husky mix Kevin (pictured) and Chihuahua Kola. "Walking both of my dogs is the biggest workout ever," he told PEOPLE in August 2011. "I have these two leashes which I'm constantly twirling, and they zigzag! They are just all over the place."