Health-conscious people are haunted by the idea that they “should” correct their posture, and many fight a chronic, uncertain and tedious battle against crookedness. But is it necessary? Can aches and pains be traced to “poor posture” in the first place? Even if they can, is it actually possible to improve posture? The characteristic ways that we sit and stand and walk are among the strongest of all habits, with deep roots in personality — and so changing your posture may be just as difficult as quitting smoking or potato chips. It had better be worth the effort!
https://www.painscience.com/articles/posture.php