4. Jean-Claude Van Dame
Long before Hollywood, Jean-Claude Van Damme was already a trained martial artist with years of karate experience. He earned a black belt in Shotokan karate and competed in full-contact tournaments during his youth.
His flexibility, kicking power, and athleticism helped make him one of the biggest action stars of the 1980s and 1990s. Even decades later, Van Damme is still respected in martial arts circles for his real training background.