The altar server can provide the model of correct posture.
WIKI:
The LDS belief includes praying to the Heavenly Father and concluding each prayer with in the name of Jesus Christ. Prayers of Latter-day Saints are not repeated from memorized expressions, and may be fairly short or be many minutes in duration. LDS leaders encourage parents to teach their children to pray daily, morning and night, and to have daily prayer as families.[4] These prayers are not facing toward a certain direction and may be kneeling, sitting or standing.
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