I've suffered from the low back problems he mentions, but mine was not primarily caused by sitting for long periods of time. It was from playing sports when I was younger--I really messed it up.
However, I recently got an ergonomic chair after minor back surgery and it is awesome! It has made a big difference in how I sit and I am much more comfortable with it.
I would also add: don't sit at your desk and eat your lunch and surf to HN. :) Go outside for a 20-30 minute walk. Walk somewhere different every day and look at things you haven't seen before. Not only do you get good exercise, you will spur your creativity and curiosity.
However, I recently got an ergonomic chair after minor back surgery and it is awesome! It has made a big difference in how I sit and I am much more comfortable with it.
I would also add: don't sit at your desk and eat your lunch and surf to HN. :) Go outside for a 20-30 minute walk. Walk somewhere different every day and look at things you haven't seen before. Not only do you get good exercise, you will spur your creativity and curiosity.