I reckon there is a lot of truth to this.
I believe our consciousness is more connected to our entire body than we realize - healthy body healthy mind right?
This attitude of good posture as well as body movement is big in my country, Norway. Some schools here have started having mediation periods before class and I know that the posture is a big part of it.
I mean when you think about the back and how virtually all our nerve endings go though there then surely a good posture, or indeed, a bad posture, as an affect.
I have a tendency to slouch when I on my labtobp
Im gonna stop that now after reading this lol!