I've been working at stretchsitting for about a week. My work chair is fabric and when seated back, it's just above the lower portion of my shoulder blades. I've found when I try to hitch to a chair, I'm using my upper abdominal muscles to keep me in this postion. I feel like when I relax them, my spine settles back down and is no longer stretched. I also have difficulty reaching around and checking to see if I have a back skin roll.