06/23/2010 at 01:00 AM EDT
"I'm not a calorie counter by any means, and I don't run. I despise running," says Kellan Lutz
, 25 (on vacation in St. Maarten in April). He does, however, pump some serious iron to get his body looking like that. Oh, and he has a few more tricks he's willing to share: "I cut back on my candy intake, swim a lot and try to drink as much water as I can. That's the best way to cut up."
Turns out the British Bewley, 29, who plays a Volturi, has a strange signature trait he looks for in women. "There is one physical feature," he says. "That they have a disproportionately large head."
Meraz, 25, has a philosophy about all the shirtless time he clocks in Twilight
as a wolf: "It's like a costume. You wear it and you own it. You can't be intimidated about your body."
To maintain his on-set energy, wolf pack member Spencer, 35, would "watch films like Lethal Weapon
," he says. "It would keep the testosterone going."
"I've always experimented with different looks," says Rathbone, 25, who plays the quick-tempered Jasper in Eclipse
. "That's why I guess I'm a character actor."