Calculate the correct height of the desk and chair. This curve is … It should do this without you raising or … The chair back height should have great head support as it works with the rest of your body. The height of the chair is fixed and cannot adjust. And finally, the armrest must support the entire forearm. The right height will mean that your legs and feet feel comfortable. Choose a chair with a backrest that is shaped to support the lower back and adjustable in height and angle. Sit on the chair and then slowly lower the height until you are happy that it is at the best height for you. Adjusting the backrest to completely support your lower back will allow your to … Rubber Shock Mounts connecting the head and back rest allow for flexibility. It's the same as the original design. Regulates the height of lumbar support relative to the seat cushion. Your feet should be flat on the floor … Back Height Adjustment. Calculate the correct height of the desk and chair. Chair L35.4 x W35 x H31.5, Seat height: … To calculate the perfect height … Incorrectly adjusted office chairs and tables lead, in the best case, to back and neck pain and, in the worst case, to permanent back or disc damage. Benefits: The lower (lumbar) region of the spine should generally have an inward cure (lordosis).