The $20,000 grand prize, announced Wednesday, goes to a team of USC students for their app called "Trainer." The app gives users a virtual creature that stays alive as the user does real exercise, tracking physical activity with interactive webcam technology.
The Agriculture Department sponsored the digital game and phone ap contest, which received 95 eligible entries. Next up will be a contest to create healthy recipes for school lunches that appeal to kids.
The contests are part of first lady Michelle Obama's "Let's Move" campaign to combat childhood obesity.