The active-play phenomenon started by Wii Sports now spreads to your whole body thanks to the pressure-sensitive Wii Balance Board (name not final), which comes packed with Wii Fit. The board is used for an extensive array of fun and dynamic activities, including aerobics, yoga, muscle stretches and games. Many of these activities focus towards providing a "core" workout, a popular exercise method that emphasizes slower, controlled motions. Family members will have fun staying active and talking about and comparing their results and progress on a new channel on the Wii Menu.
Actually you don't need to go to the gym to get a good workout. Lifting weights is actually bad for your joints. Strenght resistance training is best using your own body weight. You can get great cardio workouts without going to a gym.
I just use my old basic training workout to keep in shape (with DDR instead of long marches and running).
