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Dancepants: the music stops when exhaustion sets in

We've seen some pretty tortuous fitness wares in our day, but few are as cringe-worthy as this. The conceptual Dancepants Kinetic Music Player is a rather vanilla looking pair of exercise pants, but the internal energy makers generate juice only when the wearer is in motion. In other words, kinetic energy is used to power the connected MP3 player, and so long as you keep hustling, the tunes will keep flowing. Not like you'll really notice that Mambo #5 has stopped right in the middle of the bridge when you're laying on the ground nursing a wicked cramp, but hey...