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Tyler Kenney post at DG:  The Importance of Using Your Body in Worship

Jonathan Edwards says that a lack of external expression in worship can actually destroy Christian community and devotion.

Some bodily worship is necessary to give liberty to our own devotion; yea though in secret, so more when with others . . . 'Tis necessary that there should be something bodily and visible in the worship of a congregation; otherwise, there can be no communion at all. (From Miscellanies #101)

Read his rationale for thinking this way.