If you spend much of your day sitting at a desk, then you no doubt understand the value of a good chair. Improper posture - or an uncomfortable desk chair - can wreak havoc on your back. These days there are quite a few ergonomically correct desk chairs on the market, but perhaps the most intriguing is the Balance Ball Chair - an actual Balance Ball set in a specially made chair frame. Not only does it keep you sitting up properly, you can also do a few exercises with it while you're taking a break. The Balance Ball has already proven its worthiness in the health clubs - now it's ready to make its mark in the office world!