Spinal health and back support are very important, especially if you're a working professional who spends the majority of your day sitting in a chair. These types of chairs don't always offer adequate support and can put pressure on your spine, possibly resulting in serious back problems. Getting an ergonomic chair can help alleviate these concerns. Ergonomic chairs have adequate support for your lower back and help promote good posture, rather than prohibit it.
Make sure the seat is adjustable. When sitting in an ergonomic chair, your feet should be flat on the ground, so the chair you choose needs to be adjusted to your height.
Consider the width and depth of the chair seat. Your hips should fit comfortably in the chair width-wise. When sitting in the chair, you should have your back against the chair and your feet flat on the floor with about 2 to 4 inches between the backs of your knees and the seat.
Understand the need for lumbar support. Your lower spine has a natural inward curve, and the ergonomic chair you choose needs to support that. Also, there should be an option to adjust the height and depth of the lumbar support, so you can adjust it to fit the curve of your spine.
Decide whether you want a backrest that is separate from the seat or is part of it. If the backrest is separate, you should be able to adjust the height and the angle. If it's a solid piece, you should be able to adjust the angle. Which option you choose will most likely depend on how much you need to adjust a chair to comfortably support your back.
Check the armrests of the ergonomic chair. They should adjust so your shoulders are relaxed, while your elbows and lower arms can rest comfortably on the armrest.