Sophie Turner trains 'eight hours a day, five days a week' for intense 'Tomb Raider' role preparation

"We've been doing eight hours a day, five days a week since February last year of training, so it's been a lot," Turner said. 

"What do you think was the most surprising thing that you've learned about your body when doing that?" Cunningham asked. 

"I've learned I have a perpetual back problem, but I also realized that it's much easier to kind of build muscle if you've ever worked out before in your life, which I never had, so it has taken me months and months and months to get into good shape," Turner admitted. "That's what I've learned."

When Cunningham asked if her "GoT" role helped at all, Turner said, "No, I was the cool queen who, like, didn't have to do that. I also just kind of was the one that got beat up, not the one doing the beating. So, it's quite nice to learn how to throw a punch and not just take it."

Turner isn't the only celebrity to undergo an intense transformation for a role. 

Damon went on to say that he made a key change to his diet that helped him shed the pounds.

"I literally, just because of this other thing I did with my doctor, stopped eating gluten," he said. "I used to walk around between 185 and 200 pounds. And I did that whole movie at 167 pounds. I haven't been that light since high school. So it was a lot of training and a really strict diet." 

Fox News Digital's Ashley Hume contributed to this report.