![](https://hips.hearstapps.com/hmg-prod.s3.amazonaws.com/images/gettyimages-1327669397.jpg?crop=1.00xw:0.755xh;0,0.115xh&resize=320:* ""Stillwater" Red Carpet - The 74th Annual Cannes Film Festival")
Vikings star and real-world badass martial arts expert, Katheryn Winnick, dropped by Marie Claire on Wednesday to teach us a few tricks of her trade. Winnick, who also happens to be a black belt, spoke of how she teaches self-defense classes from time to time—even while on set in Ireland. Without skipping a beat, the actress took hold of our December issue and explained that it easily can double "as a weapon with the same strength as an steel rod."
"If you're on a bus or subway and there's a sketchy guy across from you or wherever, you can take a magazine...roll it up nice and tight, hold it in the center, and go for the head or groin. Wherever," she said. Watch out, folks.
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![](https://hips.hearstapps.com/hmg-prod.s3.amazonaws.com/images/gettyimages-675610598-1-1634552835.jpg?crop=1.00xw:0.752xh;0,0.171xh&resize=480:* ""Rei Kawakubo/Comme des Garcons: Art Of The In-Between" Costume Institute Gala - Arrivals")
