Dancing games that ask you to mimic the moves of the onscreen guide or follow the arrows are anything but new, practically spilling out of arcades both in Japan and the rest of the world. Up to this point, though, if you wanted to get a workout by busting a move in your own lounge room, you were forced to pony up for hardware to track your performance. Dance mats have long been the most accepted devices to measure skills, but they represent expensive investment and offer little in the way of interoperability with other games.