82KiB, 300x300, opvo0s86hq911.png View SameGoogleiqdbSauceNAO Is there a good source that explains your back posture position using physics (centre of gravity) Anonymous Sat 04 Jan 23:05:10 2020 No.11277598 ViewReplyOriginalReport Quoted By: Would be appreciative thanks, want to try and find optimum position.
