Back
Are you sitting with your hips back to consistently rest your back on the chair backrest?
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Is the front edge of the seat 2-3 finger widths from hitting your calves during sitting?
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Are your feet supported?
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Lower chair height or use a footrest.
Good, feet supported on the floor or a footrest.
Adjust seat depth forward to improve leg support.
Good, consistent leg support.
Move your hips back into the back of the chair.
Good, backrest is providing consistent back support.