Vayu is a Sanskrit word meaning "wind" and prana vayu means “forward-moving air.” In the Hindu tradition, the five elements - fire, earth, water, air (wind) and ether - are represented as vayus. The prana vayu is connected with the element of air and is the energy of the third/spiritual eye. The prana vayu is located at the heart center.
The prana vayu and apana vayu work together by moving in opposite ways – the prana vayu receives while the apana vayu eliminates – and are considered the two most important of the five vayus. The prana vayu is the energy governing the acceptance of substances and information (such as thoughts or senses), as well as operating the brain, sense organs, heart, lungs and throat areas.
Balancing the vayus through practicing yoga and meditation not only promotes physical strength, but also helps the yogi move closer to their spiritual aspirations.