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Alternate-Nostril Breathing
A 2008 study found that alternate nostril breathing—one of the most common breathing exercises in yoga—can increase your body's relaxation response.

Try it: Cover your right nostril and inhale through your left for a count of ten. Hold your breath for five seconds. Then cover your left nostril and exhale through your right for a count of ten. Inhale through your right nostril and hold for five seconds. Cover your right nostril again and exhale through your left. Do three more rounds.