I'm now at around two months of experimenting with a standing desk made of 2x4's and pine boards.<p>Despite using a ~28" high stool to vary my foot and leg positions for stretches and rest, I find that my flexibility has significantly worsened in specific ways. I do the 'old man groan' when I need to hoist a foot up to pull on a sock or tie my shoe. I've never done that before. Tension in my lower back is much higher. My forward bend flexibility is much worse than when I sat in a chair, despite regular stretching.<p>My neck feels better (an ongoing issue for a few years), but I have muscle pain in the left side of my upper back. It's due to some combination of holding my shoulders back and my arms up, something I never thought would present a problem. (I left-hand mouse, by the way, which is likely exacerbating the issue)<p>I'm a reasonably fit person who visits the gym every other day for about 1.5 hours (30 mins cycling, 1 hr of weight training). In the past, I've been an avid rock climber, cyclist, and yogi, so I'm fairly well in tune with my body's flexibility and strength.<p>Next steps:<p>1) Play with monitor height even more. I think it's crucial to elevate your monitor, but my Dell monitor's stand is still keeping it a little too high. I haven't yet determined the right height to achieve a neutral neck position.<p>2) Build a better chair. I suspect that support of the elbows and forearms may be important for shoulder health when it comes to day-in, day-out human-computer interfacing. I will take a mold of my back and build a chair back from it, providing lumbar, spine, and elbow support, with nothing to encourage my shoulders to rotate forward (a persistent problem with every chair I've had).