Field Trial A home visit was scheduled for eligible and interested participants and an accelerometer was send to the participant's home to wear for one week prior to the home visit. Participants were randomized to one of four XaviX sports games: tennis, bowling, boxing, or J-mat. Two research assistants visited the participant's home to complete assent and consent forms, install the game on a television in the home, and give an overview on how to play the game. Participants were given a paper game log and instructed to record time spent playing the XaviX games. Participants were asked to play the exergame for as much or as little as they like for the next 4 weeks. The participant and parent completed a baseline survey during the visit. Participants continued to wear the accelerometer during the first week of exergame play and then returned the accelerometer by mail.