"After it finished, I stopped training," the blond James Bond, 39, tells Britain's The Times.
As for his physical routine, he says he "relaxed for three months and ate what I wanted, and then it's hell because as soon as you get back in the gym, you have to work all that off, and it takes much longer than it does to put it on."
Craig, currently promoting The Golden Compass, is already preparing for the next 007 outing, at this point simply called Bond 22 and set for release a year from now.
"Last time I did a lot of weights to bulk up because I had to do it quickly," he says. "This time I'm going to do more boxing and more running. I need to be physically strong for Bond and, as much as I looked in great shape, I got a lot of injuries, probably due to the fact that I wasn't doing enough running and jumping, which is what I needed to do in the film."
Alas, for those who like a Bond who is all meat, Craig confesses that this time he plans to keep the muscle growth in check. "I won't look physically much different, but I won't be as 'no neck' as I was last time."
Credit to GirlfriendNotoriously reticent when it comes to his private life, Craig also speaks about his American girlfriend, producer Satsuki Mitchell, whom he met in 2005 and credits with helping him deal with his super-stardom. "I couldn't get through it without her. You've got to have a sense of perspective and she gives me that," he says.
Dani Abramowicz / FilmMagic
"It's a struggle, but I couldn't do it without having that closeness to somebody," he says. "Being on your own would be sad, sick and weird. I don't trust myself. I need that balance, it's crucially important. And we've been to some amazing places. I remember one night we were in this sky bar at the top of a beautiful hotel having a drink looking out over Beijing and just being blown away.
"You have to have someone to share this stuff with. We got a private viewing of the Sistine Chapel. A fantastic guy took us around and told us the history of all the paintings. How cool is that? I said to Sats, 'We have to remember this.' "