Hey davismwfl, thank you x1000 for such a considered reply. I'll see about doing one of those experiments, likely with video.

It appears that through their Social Bicycling program, JUMP bikes offer a $1 credit to people who lock a bike to a charging hub, rather than just a ‘dumb’ bike rack or pole. JUMP claims that bicycles typically require a charge every 48 hours. I’d assume it’ll work the same way with Uber Bike.

Keeping the conservation of energy in mind, any other method of charging isn’t feasible.

This is a fantastic solution to the issue, and could help solve the issue of bikes getting dumped everywhere. Combining the dock and dockless models!

Runtastic Push-Ups on iOS counts pushups either with touch input (nose touches screen) or the proximity sensor (you get close enough but your nose doesn’t quite hit the screen).

The nose solution looks especially clever, I like it.

And has the added benefit of not letting people count those half-pushups where you're still 12" off the ground.