Chairs should have a back to them, specifically a curved support for the lower half of your back. At a computer, we spend a lot of time in a static posture so standing, kneeling, or sitting on a chair without a back is not realistic. Studies show that if you spend more than 20 - 30 minutes at a computer without relaxing your back, you are very likely to perch or lean in a poor posture onto the desk or armrests. This leads to poor postures, habits, and body mechanics which make us much more likely to incur an ergonomic injury or illness.

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