"Nitric oxide is a powerhouse molecule that widens capillaries, increases oxygenation, and relaxes the smooth muscles. Humming increases the release of nitric oxide in the nasal passages 15-fold. There is the most effective, and simple, method for increasing this essential gas. Breathe normally through the nose and hum, any song or sound. Practice for at least five minutes a day, more if possible. It may sound ridiculous, and feel ridiculous, and annoy those nearby, but the effects can be potent." - James Nestor