Yoga Nidra, which is derived from the tantras, is a powerful technique in which you learn to relax consciously. In yoga nidra, sleep is not regarded as relaxation. People feel that they are relaxing when they collapse in an easy chair with a cup of coffee, a drink or a cigarette, and read a newspaper or switch on the television. But this will never suffice as a scientific definition of relaxation. These are only sensory diversions. True relaxation is actually an experience far beyond all this. For absolute relaxation you must remain aware. This is yoga nidra, the state of dynamic sleep. Yoga nidra is a systematic method of inducing complete physical, mental and emotional relaxation. The term yoga nidra is derived from two Sanskrit words, yoga meaning union or one-pointed awareness, and nidra which means sleep. During the practice of yoga nidra, one appears to be asleep, but the consciousness is functioning at a deeper level of awareness.

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.