Billy Blanks
Billy Wayne Blanks is an American fitness guru, martial artist, actor, and the creator of the Tae Bo exercise program.
Blanks began his study of the martial arts at the age of eleven, attending karate and tae kwon do classes. He was born with an anomaly in his hip joints that impaired his movement, and a clumsiness that earned him the taunts of his siblings and caused his instructors to believe that he would never accomplish much. Blanks found the answer to these challenges in karate. When he saw Bruce Lee on TV, he decided he wanted to be a world martialarts champion. The discipline of the program began to transform his body.
Source: Wikipedia