It is the only text dealing exclusively on the topic of Pranayama. The text describes more than 50 Kumbhakas. many of which are not commonly known. The author praises Meru Kumbhaka of which he describes 47 strages. These stages are a continuum of experiences the Yogi passes through as a result of continous practice of Kumbhakas. These are not described in the available texts. The text has the foreword by B.K.S. Iyergar.