I agree in part with this philosophy and had success for many years that way, but at some point I started having pain of which simply observing just revealed to me that it was my posture that was partly to blame, at which point I did everything I could to optimize the ergonomics of my workstation. So I conclude that the observational mental approach has merit, but so do ergonomic keyboards and a properly arranged chair and monitor which can pick up where the mental aspect leaves off. At least for me.