In this question I'm asking about posture -- holding the body straight, for example -- not especially asking about posture during formal meditation, which was the topic of previous questions.
I was surprised to read this answer, which includes,
... walking straight, aware of body posture, like a king/queen, straight, not like a cowboy or a pig, awareness of the body and correct it.
Sometimes (though, not often) I see something similar in other answers, for example:
You need to develop a good posture, good grace, and good gait. You should sit, stand, and walk conveniently, with good energy flow.
I was surprised to see that because:
- I don't remember that's being a doctrine in the suttas -- at most maybe I remember comments on (or descriptions of) the Buddha's or Rahula's physical appearance, e.g. "like a lion" etc.
- Buddhist doctrine emphasises view, and knowledge, and wisdom and so on -- if there is a mind-versus-body dichotomy, I'd expect Buddhism is more on the "mind" side of things.
- Some doctrines seem intended to deemphasise the value of the body -- meditations on the foulness of the body, contemplation of corpses, etc.
So -- what is doctrine about posture (from suttas, from what you've been taught, and/or from your personal experience)? And, do you know, why? And what is difficult about that practice? And does that affect your social relationships, somehow? How does it interact with practicing prostration?