From his Bio on Wikipedia..
"Jackson began boxing around the age of eleven. At fourteen, a neighbor opened a boxing gym for local kids. "When I wasn't killing time in school, I was sparring in the gym or selling crack on the strip", he recalled.[10] In the mid 1980s, he competed in the Junior Olympics as an amateur boxer. He recounts, "I was competitive in the ring and hip-hop is competitive too... I think rappers condition themselves like boxers, so they all kind of feel like they're the champ".[11] At the age of twelve, Jackson began dealing narcotics when his grandparents thought he was at after-school "