[1] e.g., http://www.amazon.com/Boss-Drafting-Stool-Foot-Black/dp/B001...
[1] e.g., http://www.amazon.com/Boss-Drafting-Stool-Foot-Black/dp/B001...
I used to work in a supermarket and would stand for nearly the entire day apart from a short tea break and lunch break. All the other employees would too. It's not uncommon.
This was, is, a very successful burger place in Dallas and I learned a ton fom the experience.
I learned a lot from that job about how to create extremely efficient processes as well as how not to treat humans.
In what you describe, people walk around and do some physical activity all the time. That's totally different than the way programmers work.
We practically stand motionless for hours, with only eyes and fingers moving. That sorting of standing is difficult to do for prolonged working hours. And might be more harmful than sitting for long working hours.