David Lee Roth
Frontman/crazy person for Van Halen, David Lee Roth has studied a variety of martial arts, including karate and kung fu. He even runs classes in martial arts. Watch this video to see Roth applying his skills in the real world.
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Jose Canseco
Jose Canseco, a former baseball slugger who has acknowledged to using performance-enhancing drugs, has competed professionally in mixed martial arts. Canseco was indeed the one who challenged basketball legend Shaq to compete in an MMA contest!