The recently opened Green Microgym in Portland, Oregon, is not your typical fitness prison: it’s a gym that’s as dedicated to the health of the environment as it is to that of its members. The gym is powered by a combination of alternative sources, including solar and ‘pedal energy’ generated from the stationary-bicycling of its patrons. While the rooftop solar panels generate nearly 3 kilowatts of electricity, the wind-generating bikes can collectively muster up as much as 750 watts.

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