What is Kapalbhati?
Kapalbhati, a shatkarma technique, means shining forehead or luminous face. It is a pranayama (breathing) technique, which involves taking a series of relaxed normal inhalations followed by sudden bellows-like exhalations. A primary effect of kapalbhati is to increase air pressure in short bursts in the nasal pharynx and sinuses, which stimulates the forward part of the brain. This has a cleansing effect on the energy channels around the head.
For more details on this read :
Lesson 316 – More Shatkarmas and Overall Guidelines
AYP books covering Kapalbhati:
Diet, Shatkarmas and Amaroli - Yogic Nutrition & Cleansing for Health and Spirit