This is really no surprise to me, but an American Council of Exercise study on the effectiveness of Wii Fit determined it to be “underwhelming” (found via Joystiq).
I’ve always said it was a combination of Wii Fit and changing my eating habits that made it possible for me to drop 40lbs. Just playing Wii Fit alone wouldn’t have really done much, but it was responsible for getting me into a habit of an (almost) daily exercise routine … and it’s fun. Going running outside for 20 minutes does not sound like fun to me, but I can do that easily in front of the TV with Wii Fit. I think everyone agrees that fun exercises will keep you coming back and those that aren’t fun turn into the dusty, unused Soloflex sitting in the corner of your den. 😀
The article does concede that some exercise is better than none, and that Wii Fit Plus might be better due to the customization of routines with less lag time in between (which I agree with). It’s an interesting read.