Hafþór Björnsson, the Icelandic strongman famous for his role as Ser Gregor Clegane, aka The Mountain in Game of Thrones, showed what a sport he was earlier this month when he laced up his boxing gloves and went sparring.

Let’s just say that he was a little out of his element and won’t be giving Wladimir Klitschko any sleepless nights, but he does get the attention of his sparring partner, who shows buckets of testicular fortitude for even getting in the ring with the 6’9″ 400-pound plus giant. Check out the spar here:

Fair play Hafþór! In the past few weeks, we have seen Thor in his natural habitat of the strongman gym, where he is training for his next challenge.