That's pretty bad but I think I can top it...
FOr a while in college I worked on a concert set up crew. We set up the stages, cleaned the arena, prepared the backstage area, etc. My job title was carrier.
The arena (I believe held around 35K) was your typical bowl type arena. The boss would station people on every row, all around the bowl. Their job was to clean the seats and surrounding areas. The water that they used came from five gallon buckets brought to them by carriers.
Each carrier was assigned a section on the bowl and he had to carry water to them constantly, all day, for 12 hour shifts. So literally, I was walking up and down stairs all day, carrying water. The way that it worked out, since we didn't have enough people, was that each carrier covered like five sections, I think it was. So basically, once you dropped two buckets at each station, the first station was ready for more water. So we basically, never stopped climbing stairs all day.
It was brutal.
Of course after just a few weeks of doing that, my legs were solid muscle and freakin' huge. But I would never do that again. It was the most physically demanding job I've ever had.