Ashtanga Yoga is a form of practice that has been shaped for over several thousand years, which develops the body, evolves the mind and aids in finding connection with the soul. In his second book on the subject of Ashtanga yoga, internationally-known yoga teacher Petri R is nen, illustrates the Intermediate series positions, which are done to purify and strengthen the nervous system and energy channels throughout the body. The positions are presented both individually and as a complete training system, with clear pictures and detailed text. Furthermore, the author describes the multidimensional philosophy found within Ashtanga yoga and its integration in everyday life. Nadi Sodhana is best suited for practitioners who have been practicing yoga for several years; however, it offers a fascinating glimpse into a more advanced practice for all who wish to explore yoga beneath the surface.