I saw a program where they took an old washing machine motor and stuck it on a bike, I think they ran it backwards but they managed to light up a light bulb. I like the gym equipment idea, I also thought about this and wondered why no one has never connected all the rowing machines, treadmills and stationary bicycles to some kind of generator. Someone should design this kind of unit that just plugs into the wall and turns your electric meter backwards. I know a few people that would be riding it all day long.
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