Talk about a dance, dance revolution: The Dancepants Kinetic Music Player, a shortlisted entry in Designboom’s Green Life competition, makes you work for tunes. (May we suggest “I Like to Move It” for your playlist?) Designed by Inesa Malafej and Arunas Sukarevicius from Lithuania, the Dancepants converts kinetic energy from running or dancing into electricity for your MP3 player.

Dancepants Kinetic Music Player, wearable technology, eco-fashion, sustainable fashion, human-powered fashion, human-powered clothing

The high-tech leggings are a “100 percent interactive way to feel the value of energy on your own,” say the designers. You can also think of the Dancepants as your own personal trainer—you have to keep moving if you want to keep grooving. On the upside, your music player will never run out of juice before you do.

+ Dancepants Kinetic Music Player