Kriya yoga is an ancient meditation technique that focuses on breathing and the spine to unlock deep states of awareness, self-realization, and spiritual growth. Kriya can provide a fast path to awakening, yet its practice has been shrouded in secrecy, passed only from master to initiate for millennia. Introduced into Kriya 40 years ago, Keith Lowenstein, M.D., offers an accessible yet detailed guide to Kriya yoga. He explains the basic techniques of the practice step by step, detailing proper posture, breathwork exercises (pranayama), visualization practices, and mantra. He reveals how Kriya is a scientific art--if practiced consistently, it will allow you to quickly enter deep states of meditation and ultimately experience inner stillness. He also explores how the practice of Kriya leads to healing and the development of compassion and the freeing joy of the union of Nature and Spirit. Sharing the wisdom of his Kriya yoga teacher Ganesh Baba, the author adds a detailed understanding of anatomy, especially the importance of the spine in Kriya yoga and energy flow. The author explores Ganesh Baba's teachings on spirit-infused science and the integration of Vedic philosophy, quantum mechanics, prana, and spiritualization illustrated in the Cycle of Synthesis. He also discusses the relationship between the exercises of Kriya yoga and Patanjali's Yoga Sutras as well as teachings from his other teachers, including Paramahansa Hariharananda. With this guide, you will gain an understanding not only of the practice of Kriya yoga but also of the spiritual wealth it brings, including the ultimate self-realization of non-dual reality.