High school students tend not to move enough. Where at elementary school kids use the break to play, high school students mostly just sit around. Most high school courtyards are quite empty and so the students can only sit around.
The muve motivates students to move by rewarding them with their own music. They only have to plug in their MP3 player or phone, sit on the stools and move from left to right. The movement of the students is transferred into electrical energy which powers the speakers for the music.