What is life and death?
What is life and death; the functions of five Vayus
Yavad vayuh sthito dehe tavaj jivanam uchyate /
Maranam tasya nishkrantistato vayum nirodhayet//(Chapter -2, Verse 3).
As long as the vayu (air and prana) remains in the body, that is called life. Death is when it leaves the body. Therefore, retain vayu. (Chapter -2, Verse 3).