A few eco-friendly gyms caught on to this idea. The average person probaby produces about 75-150watts while using a stationary bike. That's enough to power a couple light bulbs. Well, a few companies have created stationary bikes that act as generators and actually put electricity back into the grid. Might as well have your patrons help reduce your electric bill as they're making power anyways.
http://www.humandynamo.net/teamdynamo.html
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