Take a deep breath and fill the lungs. Slowly throw the breath out. Take it through one nostril and fill the lungs, and throw it out slowly through the other nostril. Some of us do not breathe deeply enough. Others cannot fill the lungs enough. These breathings will correct that very much. Half an hour in the morning and half an hour in the evening will make you another person. This sort of breathing is never dangerous. The other exercises should be practiced very slowly. And measure your strength. If ten minutes are a drain, only take five.
- Swami Vivekananda
(Delivered in San Francisco, April 5, 1900) The Complete Works of Swami Vivekananda/Volume 1/Lectures And Discourses/Practical Religion: Breathing And Meditation