A study which evaluated children's energy levels and heart rate when they played active video games such as Wii Fit or Xbox Kintect, found that they used as much energy playing such games as much as they would while exercising moderately on a treadmill.
High intensity video gaming effectively improved children's cardiovascular health. They concluded that high-intensity gaming was a good activity for children.
"The finding is good news for parents and teachers concerned about high levels of obesity and low levels of physical activity among children. Importantly, the children who participated in the study said they enjoyed playing low- and high-intensity games and were likely to continue playing them."