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When you walk into your local Essex gym, you don't expect to see some of the biggest names in film and television working out.

On Sunday (December 8), one of the biggest American film stars was joined by a popular Game of Thrones actress for a session at F45 in Chelmsford.

Mark Wahlberg, who has featured in films such as The Italian Job, Ted and The Other Guys, was pictured posing for photos in front of the F45 branded wall inside the gym.

The 48-year-old bought a minority share in Australian-based F45 Training earlier this year and visited the gym in Market Road opposite Chelmsford Market for the last challenge of 2019.

(Image: Instagram: @f45_chelmsford)

He was joined by Maisie Williams, who is best known for her role in HBO's Game of Thrones as Arya Stark - a little girl with the heart and ferocity of a warrior.

Game of Thrones follows her transformation from frustrated child to powerful, deadly woman.

The fantasy television series came to an end earlier this year after eight seasons and 73 episodes, with Maisie being part of the show from the first episode when she was just 11-years-old.

(Image: Instagram: f45_chelmsford)

A video posted on the gym's Instagram page yesterday (Monday, December 10) showed Maisie being quizzed by instructor following an intense workout.

The Instagram post is captioned: "Chelmsford members had a very exclusive F45 workout yesterday with the legend @markwahlberg AND Game of Thrones star @maisie_williams".

It has already attracted over 75 likes and received comments from star-struck F45 Chelmsford members, including one who suggested that as the reason why all the classes were cancelled on Sunday.

During the video, Maisie said: "It was so much fun, the most fun I have ever had whilst working out, you guys should definitely come and try it out."

She was then asked what her favourite part was. She replied: "The music, and just like the pace of it, its so fast, you're like don't stop."

When Maisie was then asked if she would return to F45 Chelmsford, she said: "Oh totally, I'll be back."