Two of the best book quotes about physical posture
01
“He became possessed of a great pride in himself, which communicated itself like a contagion to his physical being. It advertised itself in all his movements, was apparent in the play of every muscle, spoke plainly as speech in the way he carried himself.”
Sutra 2.46: “sthira-sukham âsanam”
Translation: The means of perfecting the posture is that of relaxing, relenting effort, and allowing your attention to merge with endlessness, or the infinite.