Played football(soccer). Have always been really determined when I do something. My team had a poor game and I was the only one doing f*ck all by the end of it. Infuriated, I started boxing where I wouldn't have to rely on others.
Became a fan shortly afterwards, loved Ali. Watched the documentary "The Thrilla in Manilla" and I realised Ali wasn't all he was made out to be morally, hence I stopped liking him and promptly became a Joe Frazier fan.