I just tried to join the Beta. Sounds pretty fun. I had this idea myself a while back, and was just came to think of it. I checked it out, and sure enough someone had done something with the idea.
https://www.bitwalking.com/beta
With the Bitwalking app you can generate Walking Dollars (W$) with every step you make.
The mining process was designed to work almost on any phone allowing people all over the world to start generating currency.
The app acts as your interface to the Bitwalking network allowing you to manage your account and operate directly from your phone.
Please keep in mind that this project sounds like it's very early phase. They don't communicate well on Twitter etc. I would be careful investing into their token sale right now. I'm not investing in this, just to be clear.
Have a good one friends. Awesome crypto rap right here.