Shortlisted in Designboom's Green Life competition, the conceptual Dancepants Kinetic Music player would "motivate you to move your feet in order to hear your music". Better shuffle about while taking that breather, or no pump-up tunes for you.
"And as long as you keep running or dancing you can be sure you won't run out of battery." We may yet reach the point where we need to self-power all our gadgets, but until that day arrives, bring on the batteries or socket chargers. [DesignBoom via Ecoterra via Engadget]