Fans of HBO’s Game of Thrones know that Ser Gregor Clegane is referred to as “The Mountain” for a reason: he’s huge. In real life, the 6-foot-9, nearly 400-pound actor who plays the terror of Westeros, Thor Björnsson, not only lives up to his on-screen stature but also uses it to frequently break daunting “World’s Strongest Man” records. So how does the Icelandic strongman go about maintaining his impressive mass? Well, he eats…a lot.
Björnsson recently spoke to GQ about his daily workout and eating regime, and explained that bulking up to his size is no easy feat. “It’s not just all about the training. It’s all around: You have to train well, sleep well, eat well. If you don’t eat, you don’t grow,” he said. “It’s just like constantly work for me: I have to eat every two hours to maintain my body mass. It is not easy. When I’m filming, I always have to have breaks to eat.”
Read More: Watch The Mountain from Game of Thrones Break Another Strongman World Record
The GOT star said he eats around six to eight meals a day, and only occasionally cheats on his healthy diet: “I eat a lot of sweet potatoes, a lot of meat, fish, chicken, good fats like cocoa butter, almonds. I love greens, like spinach, avocado, broccoli. I eat very healthy overall—but because of my weight, I need fast carbs, easy carbs. So maybe before a training session or after a training session, I eat what I want.”
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Write to Megan McCluskey at megan.mccluskey@time.com