Q. How much time should you spend sitting in a ball chair?

Answer

Never use it for more than 20 minutes at a time, and switch to a more comfortable chair every few minutes. Keep the feet flat on the floor and the core tight while working to maintain the balance on the stability ball. Buy a ball that has been treated to prevent it from bursting. A user shouldn't sit for more than two hours at a time. Sitting for extended periods of time can cause muscular tiredness and pain, especially in the lower and middle back. A user needs a ball that allows the hips to be bent to at least 90 degrees while still keeping the feet flat on the floor.