WiiFit

[MetalMilitia]

Yeah this thing will be in most peoples' closet, propping up the Donkey Kong bongos and Bass Fishing rod within about a month. It's just like Brain Training - you think you'll do it all the time as it's easy and kind of fun but then after a few weeks you can't be arsed with it any more.
I can't imagine you actually get much in the way of exercise pissing about on a 2 inch high slab of plastic either.