Work Standing Up?

I'm experimenting with this notion that us cubicle workers could benefit from working standing up, instead of slouching in our cushy office chairs all day. They (the proverbial ones) say that it increases your productivity, helps with your circulation, and sundry health-related bennies. We'll see about that. I moved my desk up so that I can work standing up (yes, all day):

I do feel better at the end of the day. I actually feel tired, instead of that crappy malaise one gets after all day spent slouching in a chair and getting sleepy. It's not easy, I will say that. I move around a lot to keep my knees from hurting. My back is still getting used to it, too (I'm used to hunching over).

All-in-all, I'd say the experiment is going well. I know this is not for everyone (some folks' knees wouldn't allow it), but for me, anyway, it seems to be working out fairly well. I figure I'll give it a month before I make a decision to either keep going with it, or go back to sitting down.