Five kinds of pranavayu: 1. Prana (moves outward as do the sense organs) 2. Aapana (moves downward as with elimination) 3. Udaana (upwards as with speech) 4. Vyaana (expansion in all directions as does the movement of our limbs), 5. Samaana: (Inwards as when we meditation turning our awareness inward to a center point).