The shield-maiden from Vikings was a real-life fighter long before appearing on screen—she began martial arts at age 7, earned her first black belt at 13, opene

The shield-maiden from Vikings was a real-life fighter long before appearing on screen—she began martial arts at age 7, earned her first black belt at 13, opened her own school at 16, and went on to earn a third-degree black belt in Taekwondo and a second-degree black belt in Karate, while also beco…