A gym in America is claiming to be the US's first to use the energy of the people working out in the gym to help power it. In fact, the Beeb news site was looking at this issue a couple of years back, wondering if you could end up getting paid to go to the gym.
It sounds pretty inefficient, though - it would be far more efficient and green to close the gym and for the members to do alternative exercise such as cycling to work. (I say that as someone who doesn't even go to the gym!)
Far more interesting is the idea of energy harvesting, also reported by the BBC around the same time. This is all about capturing the everyday energy lost when, for example, commuters walk through a station. This could be used to light public spaces, power laptops, and reduce the size of battery packs needed in military applications.
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