Researchers from the University of Hong Kong, who published a study which evaluated types of video games.  Researchers assessed three different video games and found that
children who participated in them burned anywhere from 98% to 451% more
calories per minute than those playing video games at rest.  In
addition, their heart rates were much higher.  Plus, the added
advantages are that they are fun and kids are willing to do them! 
Professionals in the prevention field think that this could be a
great way to get kids to exercise and, hopefully, to decrease their
risk of obesity.                              San Diego medical research clinical trials