Kneeling chair

A woman on a rocking kneeling chair
Variable™ kneeling chair designed by Peter Opsvik, 1979.
Kneeling chair. These chairs were the first piece of furniture designed to use with computers, and were called computer chairs. They were intended to help avoid the back problems associated with sitting in a constant hunched over condition. They usually had a rocker base, so that you could adjust your position by leaning slightly forward or back.
Kneeling chair with a rocker base.

A kneeling chair is a type of chair for sitting in a position with the thighs dropped to an angle of about 60° to 70° from vertical (as opposed to 90° when sitting in a normal chair), with some of the body's weight supported by the shins.