I recently got a very nice motorized standing desk. It definitely helps to be able to lower it and sit when I get fatigued, though after having it for more than

I recently got a very nice motorized standing desk. It definitely helps to be able to lower it and sit when I get fatigued, though after having it for more than a month, I find I spend most of my time standing now. I have polished concrete floors in my apartment. Concrete is VERY hard and very fatiguing to stand on for long periods. I got a large cork mat (http://www.amazon.com/gp/product/B001QGYIDW/ http://www.amazon.com/gp/product/B001QGYIDW/) to stand on which makes a big difference -- I think standing on something too spongy is just as bad as standing on something too hard. Many of the commercial standing mats looked too soft. I'm also in very good physical shape (I routinely squat more than my body weight of 180), but there is an adjustment period when you go from sitting all day to standing. Taking frequent breaks is key -- every hour or two, sit or walk around for 10 or 20 minutes.