To be fair a quick google search points at various similar answers. Apparently, with prolonged sitting the problem is not so much the posture, as it is inactiv

To be fair a quick google search points at various similar answers. Apparently, with prolonged sitting the problem is not so much the posture, as it is inactivity. Presumably lying may be slightly better as it does not stress the back. Personally I hate sitting and when I really have to I always tend to find the most laid down position possible on whatever chair I'm on.