Somatosensory, kinect and xbox360 are epoch-making game tools. In the past, playing games only hurt the body, but playing games with kinect triggered the whole body movement and promoted health. Some sports games such as football and table tennis can let you learn some basic sports knowledge while exercising; Some fitness games are just a virtual trainer to help you lose weight and build muscles.
To have 360, you just need to buy an independent kinect, currently around 1200, and get an adventure game. If you want to buy genuine games, it will be more expensive, about $30 each. The old xbox is easy to crack and can play all kinds of pirated games.