Astanga Yoga is a system of practice and philosophy that has been shaped over several thousand years. Consistent practice is profoundly transformational: developing the body, evolves the mind and inviting access to our true nature. In his second book on the subject Petri Raisanen 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 an integrated method of training, complete with clear pictures and detailed text. This inspirational guide acts as testament to the lineage of Astanga Yoga by including interviews with the Jois family: Sri K. Pattabhi Jois, Pramaguru R. Sharath Jois and Saraswathi Jois. Nadi Sodhana is best suited for practitioners who have been practicing yoga consistently for several years; however, it offers a fascinating glimpse into a more advanced practice for all who wish to explore yoga beneath the surface.