She’s such a fit mama! Katie Holmes opened up about her favorite workout in a new interview with Women’s Health — and the actress’ routine is actually something you can probably do yourself.

Katie plays an ex-Marine in the upcoming thriller The Doorman, so she did a lot of weight training and boxing to prepare for the role, an experience that was “thrilling” for her. “I was a five-pound weight person, and now I can do 15, 20,” Katie revealed. “And I’ve been doing a lot of boxing, which I had never done before. It’s thrilling. You can get out the stress of the day. I just go in there and think of all the mundane things that bother me. Traffic! I put off all my calls till after boxing, because it puts me in a much calmer place.”

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However, she never really wanted to start lifting weights, but the role called for it. “Which I’ve never wanted to do,” she laughed. “But I wanted to be authentic to a person who trained in the military. Which means someone who wasn’t always paying attention to the mirror and who was in shape not for vanity, but because that’s what her job called for.” She’s also a big fan of SoulCycle classes thanks to the “sense of community” it brings. “Like, if she can do it, I can do it too,” she said of the fitness franchise.

Katie takes value in her exercise, however, and noted she always has her daughter, Suri Cruise, 11, in mind when it comes to her body image. “Being a parent, every choice I make it with my child in mind. So part of getting in shape is to be an example,” she told the magazine. “It used to be about fitting into my jeans, and I’m so sick of that,” the Dawson’s Creek alum added of her eating habits. “Now I think of it more as a health decision.” You go, girl!