[temeritatis]

Check out Ujjayi or "oceans breath" if you're interested in breathwork. The latter name refers to the sound that happens as you breathe in and out in this way. All you need to do is to constrict the back of your throat as you exhale, which makes the exhale longer in a very organic and natural fashion. Because of the slower exhalation it is said to stimulate the vagus nerve in a very positive manner. More people need to learn about the link between a healthy body (and mind) and the vagus nerve IMHO.