Nintendo Wii, with exercise-related games
Price: $200 for console, Wii Fit Plus costs $90 with balance board. Other games sold separately.
So you bought the kids a Wii for Christmas – now use the console to shed some pounds. The motion-based games are a great way to get started on a workout plan, whether it's the exercise-based games Wii Fit or Wii Fit Plus, or energy games like Wii Sports Resort or Extreme Life Challenge.