What’s the best angle to sit at?

Customer: What’s the best angle to sit at to prevent back pain?

C.C. (Colm Campbell): It depends on what you are doing. An office chair would be at five degrees back from the vertical (95 degrees) because it’s a working chair. I wouldn’t make you a chair for the home at this rake. It’s too upright. The tendency would be for you to slump forward into the dreaded C position. The average home chair would be 10 degrees back from the vertical (100 degrees). There are exceptions of course. I recently made an office chair for a Professor of Anatomy. She can only sit without pain when the rake is at 85 (five degrees forward of the vertical).