There are three types of Kapalbhati. The first is Vatakrama Kapalbhati, where the focus is entirely on how you are breathing. Then there is a variety called the Vyutkrama Kapalbhati, which needs you to take in water through your nostrils and spit it out through your mouth. Then there is the Sheetkrama Kapalbhati, which is the opposite of Vyutkrama kind.