Pilates ball as computer chair
I have just replaced my computer chair with a Pilates ball. It is 75cm against mine 203cm, so not ideal but still OK. The rule, correct me if I am wrong, is that the ball size should be near your height-110cm. I could not find the ball of 90cm in size, so I bought 75cm one. Besides, your hips should be parallel to the floor. That was impossible with all of my computer chairs and it seems to be OK with this ball. Another plus I have found is that you can do some exercises while sitting on the ball and still working. Certainly, the best would be to remove your focus from PC to focus on exercises only. Then just roll back… :)