When my son was 6, we signed him up for basketball. It was a friendly recreational league, and we thought it would be good for him (as he was a little shy) to get involved in a team sport. My husband, who unlike me, played a great deal of sports during his youth, thought it was also a great way to keep him busy, fit, and disciplined. As it turned out, the kid is really good at the game of basketball. A natural, one would say.