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Lumbar supports are designed to help people with poor posture related to a backward tilt of the pelvis, eliminating the symptoms of poor posture, but not the cause. If we assume an incorrect posture and tilt the pelvis back, this in turn causes the lumbar spine to flatten. Most people have an inward curvature (lordosis) of the lumbar spine when standing. When we sit, the upper part of the legs bends about 60 degrees at the hips and the pelvis tilts back an additional 30 degrees, necessary for a 90-degree sitting position. this article https://corechair.com/what-is-a-healthy-chair-and-when-is-it-especially-needed/ helped me get rid of my back pain by finding the right chair