This is a prototype I built for Monash University’s Dept of Suatainability – an exerxise bike with varible load that feeds power back onto the mains grid!
With luck we’ll have a whole room of them soon, with a big display showing how much power everyone in the class in generating – a whole new level of feedback for the class and instructor, fundamentally changing the motivation to exercise…
futureartresearch.wordpress.com 
Wooow very nice bike