Initially I was stiff enough that I couldn’t even hold proper upright posture.  I’ve done a ton of foam roller and double lacrosse ball extension work and now have localized stiffness ~T7-T10ish.  I’m still working on those areas with slow but steady improvement.  When I work on my t-spine I usually do a quick run through of all 12 segments and by comparing I can tell which are the worst ones.  However, I’m not even sure if I can say the less stiff segments are truly normal.  How will I know when I’ve done enough?