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The actor, who played Davos Seaworth in the popular fantasy series, celebrated his 60th birthday earlier this week, and decided to mark the occasion by sharing a photo of himself at the gym.
He wrote: "Keeping rigor mortis at bay as 60 is about to hit me like an eighteen wheeler! Huge thanks to Paul and Siobhan at @bodybyrne."
In the snap, he sits casually on a weights bench wearing shorts and a vest - showing off his impressively muscly arms.
Fans flocked to the comments to remark on the 'gun show', with his Game of Thrones co-star Sophie Turner writing: "B***y hell," adding three fire emojis - Lena Heady also following suit on the emoji front.
Someone else wrote: "Those muscles are from carrying the whole show on your shoulders."
Another quipped: "Sir, do you have a permit for those guns????"
One person also said: "Davos looking jacked."
Many others commented on how good he looked for 60, with one comparing him to a 'fine wine', while some also said the star looked 'better than most 25 year olds'.
Cunningham first appeared in Game of Thrones in series two, and remained on the show until it concluded in 2019.
Speaking to The Hollywood Reporter in 2017 ahead of the final season, he said the show was his 'proudest' work, and felt it had been an 'extraordinary gift'.
He said: "David and Dan have been working on this for 12 years. The energy and the amount of brain power and man power required to get this thing as good as it is extraordinary. It's closing the circle, that's what's going to happen. It will be time for all of us to move on.
"We've all done terribly well out of it. We've all had the opportunity to show whatever levels of talent that we have, which we may not have had in previous jobs that we did. For us to have this beautiful showcase, and to be a part of this story - this undeniable cultural phenomenon - it's an extraordinary gift.
"It's one of the proudest things I have on my résumé. I will smile about this job until the end of my days.
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