Jeff Spicer/Getty Images
May 10, 2016

When Olivia Munn took on the role as Pyslocke in X-Men: Apocalypse, she wasn't messing around. Determined to make her character as bad ass as the comic books, Munn decided to do her own stunts—the result? Some pretty rad fight scenes and a slimmer figure.

While filming the movie, Munn revealed that she lost 12 pounds—but it wasn't on purpose. "It was not intentional. I was trying to learn how to do all of the stunts," the actress told E!'s Catt Sadler during X-Men: Apocalypse press junket in London. "They weren't expecting Psylocke to do a lot of fighting in the movie, but when I had signed on, I said that's something that I really wanted."

Despite being assigned a stunt person, Munn decided to take matters into her own hands. "If I wanted the fans to see Psylocke and get a good fight scene for her and the fans, I knew I had to go do it myself," she explained. "So I started training every day with Taekwondo and sword and the stunt and wire work, and I just ended up losing 12 pounds from working out every day."

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Munn regularly took to her Instagram account to share her grueling workouts during filming, and from the clips she posted it's clear that she can kick some serious butt.

Freestyle #latergram @karine_lmx

A video posted by Olivia Munn (@oliviamunn) on

Learned some new tricks...

A video posted by Olivia Munn (@oliviamunn) on

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When the film wrapped, Munn got back to her regular routine of chilling and eating snacks. "As soon as I finished, I went back to Green Bay where my boyfriend was, and I literally just ate chips and salsa." A girl after our own heart.