Studeo 55 in Vancouver is thought to be the first gym in the country, and possibly in North America, to incorporate the popular video-game console into circuit training. According to the club's owner, one session of Wii boxing, tennis or bowling provides the athletic equivalent of going for a brisk walk - burning anywhere from 75 to 125 calories, depending on the person's size and activity level.
I would have to see exactly how long that "brisk walk" actually was. I won't lie that you can get a workout while playing Wii boxing.
Need to see more evidence.
I use the Wii to workout every morning. In addition to doing weights, curls, push-ups etc, I also play some Wii Sports. I'm really looking forward to WiiFit