WRT postural issues, google "lordosis gluteal amnesia". There is a lot of info out there. Essentially, prolonged sitting causes tightening of the psoas (hip flexors) , which tends to put the pelvis into anterior tilt, thus stretching and weakening the glutes. When the glutes don't fire properly, the spinal erectors are forced to pick up a lot of the slack with a lot of everyday movements (picking things up off of the ground, etc.), which can cause back pain.
It's kind of the "malfunction du jour" right now in a lot of athletic training circles but there is a lot of evidence that suggests it is a problem with a large segment of the population. Vlad please chime in if I'm wrong about anything here.
Jay
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