The worst and best transformation I have seen was a young man that had spent his school days with his shoulders rolled forward creating a collapsed chest. Everyone knows a person like that. Grew faster than the rest of the class and didn't like being the tall guy. As a confident man he wanted to stand tall with his chest open. He also found it was difficult to work with weights for chest building exercises. The years of habitual curling the body had caused chronically short chest muscles. We worked together to open up the chest by massaging to lengthen out the shortened muscles. Three mildly painful therapeutic sessions and he was on his way to better posture and greater strength from muscles that had been given back their full length.
Correcting bad posture takes time and practice. Massage will support the muscles release of the chronic held tension that are supporting the bad posture allowing a transition into a natural healthy posture.