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The science behind Holly Holm's head-kick KO of Ronda Rousey

According to, Holly Holm kicked Ronda Rousey with 50 pounds of force to claim the bantamweight title.

Matt Roberts-USA TODAY Sports

It's been almost a week since Holly Holm shocked the world with her stunning triumph over Ronda Rousey at UFC 193, and her head-kick KO is still the talk of the town.

Fans, fighters and the media have all scrambled to make sense of the upset, trying to find order in a sport where chaos now reigns. Former sparring partner and friend Nick Diaz says Rousey made a simple mistake; UFC president Dana White says criticizing "Rowdy's" gameplan is stupid.

Amidst the bedlam, have tried to explain things with science. In an analysis conduced by Rhett Allain, the physics professor says that Holm kicked Rousey with 50 pounds of force. Check out some of the data below.

"I get an average force during the impact with a value of (173.9, -130.3, 0) Newtons and a magnitude of 217 N (48.7 pounds). Maybe that doesn't seem like much, but just consider the following points:

  • This is the AVERAGE force. At some point during this interaction, the peak force could be significantly higher.

  • Think of 50 pounds. Think of a 50 pound dog. Think of that 50 pound dog sitting on your head. Yes, that's not so fun."

Holly Holm, 34, became the first woman to beat Ronda Rousey. "The Preacher's Daughter" made history by not only KO'ing Rousey, but also establishing herself as the most successful boxing-MMA crossover in the sport. Holm extends her win streak to 10-0 and it's expected that she'll rematch Rousey in the future.

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