Of course proper posture helps back & shoulder pain, relieves headaches, relieves tension, prevents injury, makes you look better, makes people respect you more, helps you to see over people in a riot... But improving your posture is a great way to learn how to train your subconscious. Posture is primarily a non-conscious function, and poor posture is primarily due to weak nervous system pathways and underdeveloped parts of the brain. Not because of weak muscles, laziness, etc. Our brains are plastic so it can be fixed - but most people don't try, they just pull their shoulders back and puff their chest out. I sort of had a posture improvement journey over the last couple years and it's a worthwhile endeavor. Now I judge people with poor posture, which is most people, probably most of you. A good place to start is posturedirect.com.