No kidding, the power company will send you a check if you legitimately turn the meter backwards.

I've often wondered about something like this...

Refitting exercize equipment to convert all that kinetic energy to electricity, dump it back into the power grid. Sell discount memberships to the gym as a health spa, since they're generating electricity for you.

Would it be viable, in terms of generating cash?

Yes, provided the physical plant could be gotten ahold of. The popularity would be increased because every overweight fetishist would get a free membership, and would be forced* to exercise by utterly buff trainers, probably from California, where such creatures are common.

Medical professionals and waivers are also indicated. Easy does it.

*within terms of the membership

looking at the tension on their restraints, it looks like they're doing a pretty darn good job of running....