Portland has the World’s First Electricity Generating Gyms. They say that one person working out generates about 50 Watt worth of clean energy.
“People work out because it makes them feel good. Sure, there may be some grunts and sore muscles along the way. But after a while the endorphins kick in, you work up a good sweat, and you start feeling pretty good. For most gyms, it ends there. But it doesn’t have to. The Green Microgym takes those good feelings a bit further.”
By doing so these green Gyms create 36% of the energy they use themselves (combining human and solar power) and they are also implementing a whole range of energy effiency plans.