Not sure about the ballet class as I am trying to find a studio right now for my 5 year old daughter, but my daughter played soccer when she was 3 in Plano. I think it was the Plano Youth Soccer Association give them a call and if that's not it let me know and I will look for the info and find it for you, because they definitely had a league for 3 year olds. We had a good experience with it. The only downside was that all games were in Plano (we are in McKinney) and some games were at 8:00 or 8:30 so trying to get a then 3 year old and 3 month old dressed, fed, and in the car to make the early games was not always easy. I'm not sure where you live but McKinney leagues begin at age 4.