Could there be relationship between tight hamstrings, tight external rotator muscles, and the ability to stretchsit comfortably?
I've had super-tight hamstrings for a very long time. They're basically like boards. I know it's something I have to fix, but I've always de-prioritized it because I've had so many other problems getting the Gokhale techniques to work in my life.
The most basic problem I've had is with stretch-sitting. Even with the Pain Free Chair, I've tried for months to sit in the chair without pain for more than an hour or two. I've tried lengthening/strengthening my neck. I've tried creating an arch in my feet and kidney-bean shaping them. I've tried working on my rib anchor. Finally, I've tried expanding my pectorals/intercostals.
The pain is usually in my upper back, about an inch or two above the contact point with the chair. The thing is, I never get this kind of pain from standing (or walking or lying down). I could never understand what's so different about sitting vs. standing on my upper back... but now I'm wondering if the pelvis has something to do with it.
Could tight hamstrings/external rotators pull on the pelvis when sitting, resulting in distortions all the way up to the upper back? (I know this is an obvious problem for stack-sitting, but I thought stretch-sitting didn't require pelvic anteversion)
(fwiw, I've taken the course)