Here is an article from the Wall Street Journal about the rise in many offices of using exercise balls instead of chairs. The ergonomic benefits of these balls as chairs are debatable. Some claim that sitting on the balls improves posture and concentration, while some erogonomists say it is difficult to sit on for long periods of time.
I am familiar with the exercise balls because we have one at home. We used it when our kids were babies, and sitting and bouncing with the baby on the ball was a great way to get them to sleep. As an office chair, however, I would take a pass on it. To each its own, but I would’nt want to sit on one for 8 hours. Give me a plush leather highback chair, which reclines any day. If you doze off on an exercise ball, you are flat on the ground or causing a chain reaction of balls rolling down the hall.
I am actually going to write a post about these. I bought one about one month ago and they are actually quite comfortable. My back hurts after using it a while, but I know that’s my weak back muscles being worked out. I need to strengthen them anyway.