Here’s a retrofitted exercise bike that could potentially trim both your expanding waistline and your pudgy electric bill.

The visCycle let’s you generate electricity whilst you pedal – that’s 50 – 150 watts per typical workout.  Re-Source Fitness‘ plugOutt technology allows gym owners and home gym enthusiasts to just plug the bike into a wall outlet and to offset electricity use.  You’ll have to check with your local utility to see if you can sell power back to them.  Might help an off-gridder with strong thighs to power a couple of lights, plus their phone, stereo or laptop.