I've gone through all sorts of seating options (Aeron, exercise ball, kneeling chairs, etc.). None of them worked for me (I'm the type that loves to stand/walk

I've gone through all sorts of seating options (Aeron, exercise ball, kneeling chairs, etc.). None of them worked for me (I'm the type that loves to stand/walk), so I made a $14 standing desk mod: http://yfrog.com/fviw2j http://yfrog.com/fviw2j (basically four cinder blocks and caps). This has made a huge difference, I can actually concentrate better and there were some unexpected benefits: * it's much easier to demo stuff (everyone is at the right height) * taking breaks is a very low friction task (amazing how something as simple as not having to get up/sit down helps)