Star Hafþór Júlíus Björnsson, now best known as the murderous Ser Gregor Clegane (nicknamed The Mountain) on HBO’s Game of Thrones, is a pretty impressive guy, physically and otherwise. At 6’9″ and 419 pounds, he competes on Iceland’s strongman circuit, and even finished second in the 2014 World’s Strongest Man competition. But, it was his murder of Prince Oberyn Martell of Dorne that TV fans know him best for.
Björnsson: To be able to finish the whole scene without mistakes after having learned the fight scenes—they were really fast-paced and complicated. All of this was new to me, one big challenge. But we managed to make this incredible scene, one of the more talked-about of all.
We trained from morning until evening for weeks and went through every detail of the fight. C.C. Smiff is probably one of the more knowledgeable in the [movie fighting] business but the whole GoT team is incredible.