He wants audiences to be startled at the sight of his emaciated frame. "I think it has to be," Garfield said. "It's the truth of what these guys would have gone through."

Garfield and Driver also went on a silent retreat in Wales to prepare for their roles.

"It's a wonderful thing," Garfield said. "Just after about three days everything shifts. Your central nervous system just kind of settles down and it becomes normal."

He added, "You go into all these meditation and prayer rooms and the quiet in there is the loudest think you've ever f--king heard. It's crazy. You literally go in there and your ears start ringing. it's the purest silence that you could know. I've done a few of these things in the past on my personal time. I love all this spiritual exploration stuff. I'm fascinated by it."

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