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If you’re looking to get fit, Tom Cullen, star of History’s Knightfall, has a suggestion for you: wear chain mail.

The actor stars as Landry, leader of the Knights Templar, in the newest scripted drama from the network home of Vikings — which meant wearing 50 pounds of armor nearly daily for the better part of a year.

“I didn’t want to weigh the costume early on, because otherwise it would just become a thing in my head. I have weighed it since and it has become a thing in my head,” Cullen, who played Lord Gillingham in Downton Abbey, told Rotten Tomatoes. “The costume weighed 50 pounds, which is a lot to be carrying for 14, 15 hours a day when you’re fighting and riding horses. My body changed shape. I went from fit and kind of slender to muscular and big, just from the fact that I was carrying this amount of weight, this heavy costume.

“I couldn’t even get on a horse when I first started,” he confessed. “I had to have a stepladder because I didn’t have the power in my legs to get over the horse. But by the end of the shoot, I was leaping and running and jumping on horses. It was intense.”

So if you want to “get swole,” try the Chain Mail Workout!

“It’s where you wear 50 pounds of chain mail for seven months, every day, 15 hours a day,” Cullen said. “That’s all you have to do. And you’ll end up [muscular]. I’ve had to go to my wardrobe and buy all new trousers because my ass is so big. Honestly, if you want an ass like Kim Kardashian, become a knight.”

Knightfall takes place in the 1300s and follows the Knights Templar as they hunt to recover the Holy Grail in the final days of their reign, ahead of their eventual downfall. The series was shot in Eastern Europe on a Prague backlot — “they built medieval Paris, they built a temple, a palace, streets, a market, a moat, castle walls, a church, shops, alleyways, a pub — it was extraordinary,” Cullen said. The show tackles the later days of the Knights Templar’s reign of power.

“They were such a fascinating, clandestine sect,” Cullen said. “That the myriad of lies and layers that they bathed themselves in — it’s very difficult to unpack all of that. It was fascinating to learn about them. It was a real educational process for me.”

While, like most people, Cullen had a working knowledge of the group, he learned a lot while simply researching for his role.

“One of the things that really stuck with me was that they invented to first bank,” he said. “They created the banking system, and they created the first checks. They became the wealthiest fighting force in the world. And they answered to no country, no king, no queen. They only answered to God and to the Pope. No borders. You could cash your money in France, and you could take it out in Jerusalem. They were kind of untouchable. Fascinating guys. The thing that really surprised me was the level of their power. You learn about how they were in the battlefield. They were extraordinary. They would never leave. Even if they were losing, they would never turn their back and run. They would basically only surrender when the last man had been killed. That level of bravery and intelligence is an extraordinary combination, I think.”

Cullen’s character, Landry, was taken in by the Knights Templar as a 10-year-old orphan.

“All he’s known is war, fighting, and God. When we first see him in episode 1, he’s a very brash young maverick knight who ultimately loses the Holy Grail and loses Acre, the last stronghold in the Holy Land, which is the one thing that he understands himself through. The series is set 15 years after that event, and we find him questioning everything about himself. He’s questioning his faith and his own identity. He’s a very contradictory, very complex character. He is lying to his brothers. He’s having an affair with a woman. But he is immensely loyal. He is maybe the most fearless, brave knight. Yet he is starting to discover his own humanity and his mortality. He is a very pious man and is still a very faithful man, yet he is starting to discover who he is outside of his brotherhood.”

Yes, that’s right — there’s still plenty of sex on this show about religious monks, and Landry’s dedication to the Knights Templar only wavers when his chastity vow is involved.

“He’s very faithful to her,” Cullen said. “He’s a one-woman kind of guy.”

Except he’s supposed to be a no-woman kind of guy.

Added Cullen, “He’s a very complex guy, which is the kind of guy I’m interested in watching.”

The season will include major developments about Landry’s love — in the first episode, even — but his relationship will take a back seat to his main quest: to recover the Holy Grail.

“Landry goes on a pathological hunt to try and find the Grail, because I think that he entwines a lot of his own identity into that piece of pottery,” Cullen said. “I think that he hopes to find it not only to garner enough power to go back to the Holy Land, which is what he thinks that he should be doing, but also to return himself back to who he was — search for his identity before he became this very complex guy. What’s great is that on the way, we see his life fall apart, and as he discovers more about himself, he discovers more about the people around him and the lies that are entwined around his whole life and his whole existence.”

in rottentomatoes.com by Jean Bentley