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Well, many people have the wrong sitting posture. Especially in the office environment, which we often use the computers for the most of the times.
Pressures in supported sitting are 40% more than standing.
It creates a backward tilt, flattening of low back and forward shift in Center of Gravity.
It places load on discs and posterior structures of vertebral segments.
In standing, natural curvature of lumbar spine is increased, reverse for sitting.
Prolonged sitting in flexed position may increase resting length of erector spinae muscles.
(overstretch the back of the ligament structure)
This means, you may have a kyphosis posture.