Most of the time the head moves horizontally. The chin is vertical, does not swing from side to side, does not lift the chin, and is slightly adducted. Don't twitch your shoulders with your neck or shrug your shoulders.
In this way, put your hands on both sides of your ears, put your consciousness on your ears, and put your ears on your left and right palms, just like listening carefully to what the two sides are saying.
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