“Clarification of Pranayama” is a worthy addition and continuation of “Clarification of Yoga” by Sri B.K.S. Iyengar, a book that is currently a classic textbook on the practice of Hatha Yoga. This book is also a practical, complete and reliable guide for all who wish to improve in the yogic art of breathing. The respiratory system is presented both from the point of view of modern anatomy and from the point of view of ancient yogic texts. 82 breathing techniques of 14 main pranayamas are described, from the simplest to the most advanced. The stages of each pranayama are summarized in tables. Comprehensive data on the philosophy of yoga and such important topics as nadis, bandhas, chakras, Bija mantra are presented. Special attention is given to the obstacles and dangers that must be avoided in the practice of pranayama. For those who want to seriously study this art, a progressive 200-week course designed for 5 levels of difficulty is offered.