Shoes that store kinetic energy

This thought was posted on Thinkaloo on 6 March 2008 by member bruce

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This is probably a very unrealistic thought. I am posting it in case any ambitious engineers might want to give it a go. Some gyms in California store kinetic energy that is produced when people run on machines or when they lift weights. The energy is then converted into electricity and is re-used or sold. What if the shoes we wear could also store the kinetic energy we produce when we walk or run? We could then convert it into electricity, re-use it at home or sell it