Rechargeable batteries, that you charge up with a exercise vuke.
Anyway, I exercise everyday to keep my cholesterol down & might as well do this. Sorry, to the point now, one day on "The Drs" I saw a stationary bike hooked to a rechargeable battery & it would be great to use the energy to charge up a generator battery so you cab use it later. I went & trued looking it up after that show & had no luck. Anyone here now of a way to recharge a battery with a exercise bike? Something like this http://www.freelights.co.uk/product.html only no flashing lights & a bigger gen. to use the charged gen. later to run something.