Enforcing mandatory exercise at work

I'm working in a large but low (only 4 floors) building with many printers. Today I came upon a slightly evil idea. Instead of letting people choose the printer on which to print their documents, the administrators should arrange the system to choose the destination printer randomly. Benefits would be twofold:

1. People would be forced to walk longer distances, which is healthy. This is beneficial especially for people working at computers, sitting most of their working hours.


2. I also guess that paper would be saved: in order to avoid the previous point, people would avoid printing stuff unless they absolutely have to.

To make the first point most effective, people should be locked out of elevators, except disabled people which would get their own "elevator key".