The last time we saw The Mountain on “Game of Thrones,” he was hurtling to his death in a giant fireball at the end of a fight with his brother, the Hound, in King’s Landing.

Since then, Hafthor Julius Bjornsson, the 6-foot-9, 441-pound actor who played the Mountain, has moved on.

He’s in Florida, defending his World’s Strongest Man title, which he lost during the finals on Sunday. Bjornsson, a native of Iceland, first won the title last year in the Philippines, and he may have the upper hand, now that he can devote more time to competition since “GoT” wrapped. (He also does commercials for Sodastream and is considering several other acting projects.)

“You have to be willing to work 365 days a year and be absolutely obsessed with what you want to achieve and if you’re willing to go that far then you’re able to be the World’s Strongest Man,” Bjornsson, 30, tells The Post. “I’m happy I was part of the show. It opened up a lot of other opportunities for me and I’m just grateful for that. I’m doing more acting, but I’m also focusing on strongman. Obviously, my goal is to be back-to-back champion.”

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While filming “Game of Thrones,” Bjornsson had to divide his time between the show and training for WSM — and that wasn’t always easy. It took seven hours to transform Bjornsson for the final battle between GoT’s Clegane brothers, where the Mountain’s helmet is taken off to reveal Qyburn’s back-from-the-almost-dead experiment, Coupling that with long shooting days — one lasting 18 hours — finding time to train was tough.

"Game of Thrones" actor Hafþór Júlíus Björnsson (Thor) “The Mountain” leads a march through the streets of Times Square to celebrate the launch of Monster Energy’s new performance beverage REIGN Total Body Fuel on April 16, 2019. He's out to defend his World's Strongest Man title following the "Game of Thrones" series finale.

"Game of Thrones" actor Hafþór Júlíus Björnsson (Thor) “The Mountain” leads a march through the streets of Times Square to celebrate the launch of Monster Energy’s new performance beverage REIGN Total Body Fuel on April 16, 2019. He's out to defend his World's Strongest Man title following the "Game of Thrones" series finale. (Getty)

“The days could be very long and tiring. Training while your body needs rest can be even worse,” he says.

Finding the resources to train could also be difficult. “We need very specific equipment to train for World’s Strongest Man and it’s very hard to find this equipment in a normal gym. That’s why I have my own gym back in Iceland,” says Bjornsson.

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Growing up in Iceland, Bjornsson knew all about World’s Strongest Man because his fellow countrymen Jon Pall Sigmarsson and Magnus Ver Magnusson are each four-time titleholders.

They opened the doors for us, because we’re a small nation and to have won it nine times already, that’s very impressive. I think it shows that something is in the genes or maybe it’s the water,” he says.

With 11 WSM titles, the US is the only country with more wins than Iceland. One of Bjornsson’s top competitors in this year’s finals is Brian Shaw, representing the United States. Shaw has four WSM titles, with his last coming in 2016.

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“I can very much relate to being on the road and filming and trying to train. It’s a whole different ball game,” Shaw said.

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Shaw has a show premiering on the History Channel on July 7 called “The Strongest Man in History,” The show attempts to replicate the feats of strength from strongmen throughout history.

“It’s kind of a double-edged sword if you will, because it’s great to have the opportunities but it also at times can take away from the training and recovery that you need to be the best at strongman,” says Shaw, who says he’s never seen a single episode of “Game of Thrones.”

Bjornsson’s competitors in the 42nd annual WSM finals my have their sights set on knocking him off the strongman throne, but to quote “GoT’s” Ser Bronn of the Blackwater: “He’s freakish big and freakish strong. And quicker than you’d expect for a man of that size.”

When asked whether the quote really fits him, Bjornsson says it does: “I’m freakish strong and freakish fast for my size, and I’m freakish big, so yes.”

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This article originally appeared in The New York Post.