This balanced manual (in three volumes) is developed by the Bihar School of Yoga. It uses different directions of yoga - hatha yoga, bhakti yoga, jnana yoga and kriya yoga, offering a consistent system for mastering yogic mastery, verified by many years of practice, which is the most effective and safe. In this case, special emphasis is placed on the practice and application of yoga in everyday life. This is a complete presentation of the ancient teachings of Kriya Yoga, structured in such a way as to acquaint the reader with the various practices in as much detail as possible, gradually and in order of increasing complexity, as if studying under the direct guidance of an experienced mentor. This course aims to develop in the practitioner a state of perfect bodily health, peace of mind and psychological stability, perfect intellectual clarity and higher spiritual knowledge and awareness and will be useful for people practicing yoga of any level of experience. This volume includes the preparatory part of the course.