I have a small tip that I used to give me a feel for good ahoulder alignment. When doing shoulder rolls, instead of rolling them back one by one, I roll both shoulders at the same time being careful not to arch my back. I do this in the mirror and I can see a real visual diffrence when I go from hunched over to a straight upper body. Esther I am wondering what are your views on this? but to me it was something that I did one day and it feels more right bbecause I can easier see and feel my chest area open up.