On the sacramental hermeneutics of fittingness in posture for prayer

Okay: exam time. Let me pose this simply as a question for discussion. What posture is most "fitting" and therefore expressive of a proper disposition for praying, say, the penitential prayer of Psalm 51 --

• standing?
• kneeling?
• lounging on a piano top with a Martini in hand?
• govelling in the dust?

Discuss and offer a rationale.