What are Vayus or “Vital airs”?

Vital energy is generated in the unit body through the media of five internal and five external Vayus (airs). Of the five internal Vayus, viz., Práńa, Apána, Samána, Ud́ana and Vyána, the Práńa, situated between the navel and the throat controls the functions of lungs, heart etc.; the Apána, situated below the navel (i.e., between...