Dolph Lundgren
The action star, who played the villainous Ivan Drago in “Rocky IV,” was the European champion in Kyokushin karate in 1980 and 1981. “Karate has been so important to me, it is almost impossible to imagine myself and my life without it,” he said, according to kungfukingdom.com. “Every time I’ve strayed away from the martial arts, I’ve somehow lost part of myself.”