Imperioli is 3rd Dan in ITF-style taekwondo. From the Washington Post: The 40-year-old actor, who plays the heroin-addicted, hothead mobster Christopher Moltisanti on "The Sopranos," says he owes his clean new real life to tae kwon do teacher Tae Sun Kang, who also trains Imperioli's wife, Victoria, and children. "I was in terrible physical shape. I smoked a pack a day," he said. "Tae kwon do has transformed our family in body, mind and spirit. It has changed us as human beings."