Kellan Lutz has revealed Sylvester Stallone taught him his work out secrets of how to get massive muscles.
The 29-year-old actor appears alongside Sly, Arnold Schwarzenegger, Mel Gibson, Harrison Ford, Jason Statham and a string of other veteran action stars in The Expendables 3 and told Collider.com that the cast would all work out on set together.
Kellan revealed: "Sly is awesome because he's like, 'Kellan, all you gotta worry about is your silhouette, how you look, how your silhouette looks. If you can get your traps big, your chest big, your back big, then you'll look big.' He had all these cheats for looking big and he looks massive."
And the 67-year-old Rocky star commissioned the prop department to custom-make weights for the cast.
Kellan revealed: "Sly has all these little gimmicky, really badass workout devices, like these long bars that are eight pound bars, about three feet in length that he would use for his forearms. He always had it on set and everyone loved it. So, he had the prop department build these forearm bars."
And the Twilight star told how the cast worked together and played together.
He said: "There was no competition at all, it was actually like the best frat party I could think of. I was never in a frat and having these guys who are just fun and funny and their own characters on and off screen, but they're all boys at the end of the day. We would all go out or we'd all go to dinner, everyone came along."