Oookaaaay, I understand now. I bow to the God of Erognomics and pay my penance with the back pain of a thousand exploding stars.
I have seen the error of my ways and foulness of my past practice of bad posture. No more will I sit Indian-style on my chair, or slouch with my feet up as I type.
I offer you, O God of Erognomics, these sacrifices of lumbar support pad and sloping butt pad thingie with tail bone cut out.