Shadow Yoga, Chaya Yoga: The Principles of Hatha Yoga
"This invaluable book introduces the reading public to the full scope of the practice  of genuine hatha yoga. Full of hints that veteran practitioners can follow to revolutionize  their practices, it should be read by every serious student of yoga."—Dr. Robert  Svoboda, author ofAyurveda: Life, Health, and LongevityandLight on Life: An Introduction  to the Astrology of India