A couple of years back I was exploring models for a next-gen health club that captured peoples' energy through a combination of min-generators on cardio and pie

A couple of years back I was exploring models for a next-gen health club that captured peoples' energy through a combination of min-generators on cardio and piezo-electic devices underneath classroom floors. Back then, the cost didn't justify the potential to capture energy, but developments like this start to make the concept potentially more viable.