Those muscles aren't just for show.
Hafthor Bjornsson, who plays The Mountain on "Game of Thrones," lifted a log that weighed more than 1,400 pounds and walked five steps with it to break a 1,000-year-old record of legend, according to reports.
Bjornsson, a strength contest regular who won Europe's Strongest Man last summer, performed the feat en route to finishing first in the World's Strongest Viking competition in Fefor, Norway, on Jan. 31.
The strength-dedicated website Iron Mind noted that according to lore, a man named Orm Storulfsson walked three steps with a log of similar weight but broke his back.
"My back held up fine!" Bjornsson said on his Instagram, adding, "Nothing can stop me! Nothing can break me!"
The legend of the Icelander Orm Storulfsson says that he walked three steps with this MONSTER WOODEN LOG which weighs over 600kg's/1320lbs! It took 50 mere mortals to help him placing it on his back! After he took his third step his back broke under the enormous pressure and he was never the same after that! Well today my friends I made history!! As well as winning the title of The World's Strongest Viking for the second time in a row I carried this MONSTER LOG 5 steps! My back held up fine!! As I'm on my way to my ultimate goal to win The World's Strongest Man! NOTHING CAN STOP ME!! NOTHING CAN BREAK ME!!