Generating electricity by working up a sweat

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Like the sustainable dance club we featured last year, a gym in Hong Kong is turning human movement into kilowatts. While the gym's customers are working up a sweat on cycling and cross-training machines, the energy they create is used to power lighting. Excess energy is stored in a battery. The "Power by You" concept was developed by French inventor Lucien Gambarota and Californian entrepreneur Doug Woodring. Gambarota rigged up the exercise machines using a variety of bits and pieces, from washing machine parts to a car battery. California Fitness, part of an international chain of fitness centres, won't have…

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