Researchers at Baylor College of Medicine in Houston followed 78 children between the ages of 9 and 12.
They gave each participant a new Wii video game console. Half were invited to choose from a selection of five active fitness-focused games, while the other half chose from inactive games.
The researchers found no increase in physical activity in either group after three months.
The American Academy of Pediatrics recommends children get at least one hour of moderate to vigorous physical activity each day.