Who needs the gym?

Who needs the gym when I can run my ass off at work? I had to work an extra shift this week because one of the other supervisors was on vacation. We were flat out busy as hell with all sorts of craziness going on in multiple areas. Some of those hallways can be pretty long and I was speed-walking all day yesterday through those hallways. I can't count every day at work as aerobic exercise but I'm sure as hell counting yesterday as exercise.