[agumonkey]

A dude did that, it didn't last long, but I'm still thinking about opening one. Just to avoid the double madness of powering lights and devices so people spend energy in the air :)

Even if you don't generate much, at least your biomechanical efforts are used somewhere.

[benj111]

Surely it's triple madness if you're driving to a gym to go on the running / cycling machine.

[a9h74j]

Not just driving to the gym, but driving twice around the parking lot to find a closer space for a shorter walk.

And wasn't it Mumford who observed that given the time it takes to earn the money to buy a car, on average it can be faster to walk than to drive.

[agumonkey]

Oh yes I forgot to mention this :)

[akvadrako]

You could have them power fans or keep the lights on. Things that can use just a few watts.

[agumonkey]

each one yes, but if you have 20 persons averaging 100W, you can power a kettle :)

[hinkley]

Having been to a gym, I sincerely hope any power scavenged is use to power the ventilation system.