Jamie Dornan‘s body looks absolutely ripped for his role as Christian Grey in the movie Fifty Shades Darker and he’s opening up about why he packed on more muscle than he did for the first film.

“[Director James Foley] talked to me a lot about making him more of physical threat and toughening him up a bit and he had me going to the gym a lot more than the first one,” the 35-year-old actor said in a clip released by TooFab.

“I’m substantially heavier than I was in the first one,” Jamie added. “But it made sense to me that this was someone who got in a lot of fights as a kid, went through awful stuff when he was a child and I think he wanted that to come across on screen more than it would have in the first one.”

You can see Jamie stripping down in the film, which is currently available on Digital HD and will be on Blu-ray and DVD on May 9.

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