Charlie Hunnam Says the Secret to Maintaining His Toned Figure Is Sex... and Lots of It!

Men's Health

Charlie Hunnam may be a regular at the gym, but he loves sweat sessions in the bedroom, too!

Sporting a pair of dark-wash jeans and a fitted blue T-shirt that perfectly hugs his biceps, the 165-pound King Arthur: Legend of the Sword star covers the April issue of Men's Health. In his accompanying interview with the magazine, the 36-year-old actor gets candid on maintaining his incredible physique, which often includes making love to his longtime girlfriend, Morgana McNeils.

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"I try to do it all," he says of his workout plan. "I also try to make love as often as I can. That's an important part of fitness."

In addition to sex, Hunnam credits running, swimming, jumping rope, hiking and Brazilian jiu-jitsu for his impeccable build, and hopes to be running "up mountains" at the age of 70.

"I train a lot every day because I'm f**king crazy," he jokes. "We are supposed to be very active animals. It's our DNA. Sweating is how I change my oil every day. I just feel happier, more positive, energized, and disciplined if I work out."

To prepare for his role as King Arthur in the Guy Ritchie-directed film, which hits theaters May 12, Hunnam says he had to pack on 20 pounds of muscle, which caused him to work out "like a motherf**ker."

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"When you're training every day in a combat discipline, it just gives you that eye of the tiger," the British actor dishes. "Then if someone acts aggressively toward you, I can run all the scenarios through my head -- you know, like I'm going to step to the side and put an elbow through your face."

Hunnam says one of those scenarios is when he had to respond to cyberbullies attacking his girlfriend via social media last year.

"The way I grew up, if you want to talk s**t, talk s**t to someone's face and be prepared to fight," he adds.

Aside from his truly epic quotes in the magazine, the pics from his photo shoot -- which include one of him looking as hot as ever while dusting off dirt in a plain white tee -- are almost as sexy as the first time the former Sons of Anarchy star appeared on the cover of the magazine's December 2014 issue.

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Who could forget that photo of him glaring into the camera, clad in a fitted graphic T-shirt and blue jeans, atop a vintage car?

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He'll always be badass biker Jax Teller in our eyes.

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WATCH: Shirtless Charlie Hunnam Heats Up the 'King Arthur: Legend of the Sword' Trailer