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Vocalise. This is connected to the vagus nerve exercises, but you can do it however, you want. Hum a tune. Trill your lips loudly. Do a karate chop and shout a Kiai. Do the do-ray-me voice exercises up and down the scales. Do the ooooo-eeeee exercise (where you start low on oooo and go up high on e, like a siren sound). …