About a year ago, I started some new video game exercises using a Sony Eyetoy. Worked great, until i twisted my left knee from the workouts. i wound up with a torn meniscus and had surgery to fix it. I'm better now, but I'm looking forward to some other so called "exergames" that are expected to hit the market in a few months.
Anyway, I know the struggles wiht being overweight.
Hang in there!