Even with the lightest heart in the world, the lower back has to work pretty hard to maintain a good erect posture – a giving posture – through the day. But even a hint of depression, deflation, heaviness, and collapse is inevitable. This is why we must learn to master our moods – learn to be happy as a matter of course rather than only when the world pleases us. Let the bastards get you down even for a second and you are effectively retreating into the cesspool of self.