Yes, you read right, by jumping: you hold the iPhone/Touch firmly in your hand, listen to the music, get a knack of the rhythm and jump on cue, trying to land exactly in the middle of the target shown on the screen. The more accurate your timing, the more points you get.
Think of it as Tap Tap, but using your center of gravity instead of your fingers as your input device.
As it turns exercise into fun, Jump Jump is not only innovative, it is beneficial too. And while you jump out of the crowd, you can track the number of Calories you're burning, and your overall fitness improvement.