UCLA ergonomics is your friend: http://ergonomics.ucla.edu/office_Chair.html http://ergonomics.ucla.edu/office_Chair.html http://ergonomics.ucla.edu/ws_checkl

UCLA ergonomics is your friend: http://ergonomics.ucla.edu/office_Chair.html http://ergonomics.ucla.edu/office_Chair.html http://ergonomics.ucla.edu/ws_checklist.html http://ergonomics.ucla.edu/ws_checklist.html I dont think there's a perfect chair, just pick a sturdy one that adjusts a lot and keep adjusting it all day. Also, i find that when the chair is on a carpet floor, thus not able to roll easily, i feel more comfortable than when it rolls easily.