I worked in a nursing home for quite a few years... It was quite spread out with a north, south, east and west wings... Everyone had single rooms with showers, plus linen cupboards conveniently places for staff... all in longs corridors.
I thought we were walking a lot, so I bought a pedometer, set it to my stride, and found out we each walked 10km per day.
On my days off I walked for at least 45 minutes, and ending up with an injury to my calf muscle.. That took more than a year to heal, and anything strenuous these days, I can still feel it.
These days, the most exercise I get is pulling to lever on my chair and getting back up...