Kapalabhati means skull shining. Strictly it is a kriya, one of the classical Hatha yoga techniques, rather than a pranayama, and it is the preparation for Bhastrika.
It is a fundamental Hatha yoga technique. It is traditionally used to clear the airways and wake up your energy.
Contraindication: do not practise Kapalabhati if you are pregnant or on your menstrual cycle.
