We have spoken about Yama and Niyama. The next is Asana (posture). The only thing to understand about it is leaving the body free, holding the chest, shoulders, and head straight. Then comes Pranayama. Prana means the vital forces in one's own body, Âyâma means controlling them. There are three sorts of Pranayama, the very simple, the middle, and the very high. Pranayama is divided into three parts: filling, restraining, and emptying. When you begin with twelve seconds it is the lowest Pranayama; when you begin with twenty-four seconds it is the middle Pranayama; that Pranayama is the best which begins with thirty-six seconds. In the lowest kind of Pranayama there is perspiration, in the medium kind, quivering of the body, and in the highest Pranayama levitation of the body and influx of great bliss. There is a Mantra called the Gâyatri. It is a very holy verse of the Vedas. "We meditate on the glory of that Being who has produced this universe; may He enlighten our minds." Om is joined to it at the beginning and the end. In one Pranayama repeat three Gayatris. In all books they speak of Pranayama being divided into Rechaka (rejecting or exhaling), Puraka (inhaling), and Kumbhaka (restraining, stationary). The Indriyas, the organs of the senses, are acting outwards and coming in contact with external objects.