Just to throw it out there, I much prefer sitting at my desk, but I make it a point to spend some time wandering around the office/outside the building for at least a few minutes every hour.
I'm also not a developer though, so I don't need to be in focus mode for long periods of time.
Imagine sitting perfectly still for eight hours a day.
I just imagined both, and I preferred the standing still nonsense to the sitting still nonsense.