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The first part of the book is devoted to the physical phase of the Science of Breath; then the psychic and mental sides are considered, and finally the spiritual side is touched upon.Singleton, Mark (2010). Yoga Body: the origins of modern posture practice. Oxford University Press. ISBN 978-0-19-539534-1. Haskell, William L.; etal. (2007). "Physical Activity and Public Health". Circulation. 116 (9): 1081–1093. doi: 10.1161/CIRCULATIONAHA.107.185649. ISSN 0009-7322. PMID 17671237.

Sadhguru, looks at what kriya yoga means, and what it takes to walk this path and explore the very mechanics of the life process. Yoga as exercise is defined by Merriam-Webster as "a system of physical postures, breathing techniques, and sometimes meditation derived from [traditional] Yoga but often practiced independently especially in Western cultures to promote physical and emotional well-being". [O 3] This method of respiration is known as Rib Breathing or Inter-Costal Breathing, and while less objectionable than High Breathing, is far inferior to either Low Breathing or to the Yogi Complete Breath. In Mid Breathing, the diaphragm is pushed upward, and the abdomen is drawn in. The ribs are raised somewhat, and the chest is partially expanded. Low BreathingYoga is an invaluable gift of India’s ancient tradition. This tradition is 5,000 years old. It embodies unity of mind and body; thought and action; restraint and fulfillment; harmony between man and nature; a holistic approach to health and well-being. It is not about exercise but discovery. It is not about strength but sensitivity. It is not about competition but cooperation. It is not about self-assertion but self-restraint. It is not about violence but peace. Yoga can open up a new horizon of peace and harmony.”

For example, the authors view the first two steps of Yoga namely , Yama and Niyama as a way of minimizing negative thoughts and reinforcing positive thoughts. Similarly, they view the next two steps, namely Asana and Pranayama, as training the attention system in the brain. They argue that proper practice of these 4 initial steps of Yoga results in a calmer and focussed mind. They assert that this calm state of the mind is the one that is actually responsible for the observed [43] reduction in stress, and consequent health benefits of Yoga. Zen is one form of spiritual path which has no scriptures, books, rules, or particular practices – nothing. It is an uncharted path. It is not very different from what Yoga is. What we call Yoga, they call Zen. In Yoga, we present the same thing as a science while in Zen it is handled as an art form.” Is Yoga suitable for beginners? The Cerebro-Spinal System consists of all that part of the Nervous System contained within the cranial cavity and the spinal canal, the brain, the spinal chord, together with the nerves which branch off from the same. This system presides over the functions of animal life known as volition, sensation. They go on to explain each further step of Yoga as a way of modulating the brain structures, finally leading to a completely tranquil mind which has many spiritual connotations, in addition to physical health enhancement and stress reduction Imperfect breathing only uses a portion of the lungs cells and a great portion of the lung capacity is lost, the system suffering in proportion to the amount of under-oxygenation.

A comprehensive guide to get started with all things yoga. Sadhguru's articles clarify exactly what yoga is and what it's not, give us an introduction to many awe-inspiring yogis, and present us with tips to get the best out of our yoga practice. Kriya Yoga is the path of using one’s inner energies to reach the ultimate. Following the path of pure Kriya Yoga is a very demanding but powerful way to walk the spiritual path. What is Kundalini Yoga? Yogic breathing exercises have been practised in India and further afield for thousands of years. Deep breathing is known to improve the efficiency of oxygen exchange in a way that benefits the mind and the body. Medical research shows the yogi science of breath reduces the stress response in the body and delivers more oxygen to the bloodstream. Sadhguru answers a question on the different types of yoga and explains that any yoga that you do comes under four essential paths.

Sadhguru looks at how Agastya Muni, one of the Saptarishis – the first seven disciples of Adiyogi – took the yogic sciences across the Indian subcontinent. This happened over 15,000 years ago. The science of yoga is the scientific basis of modern yoga as physical exercise in human sciences such as anatomy, physiology, and psychology. Yoga's effects are to some extent shared with other forms of exercise, [O 1] though it differs in the amount of stretching involved, and because of its frequent use of long holds and relaxation, in its ability to reduce stress. Yoga is here treated separately from meditation, which has effects of its own, though yoga and meditation are combined in some schools of yoga. The percentage of civilized men who breathe correctly is quite small, and the result is shown in contracted chests and stooping shoulders, and the terrible increase in diseases of the respiratory organs, including that dread monster, Consumption, “the white scourge.” Eminent authorities have stated that one generation of correct breathers would regenerate the race, and disease would be so rare as to be looked upon as a curiosity. Whether looked at from the standpoint of the Oriental or Occidental, the connection between correct breathing and health is readily seen and explained.Long, Ray; Macivor, Chris (2009). Scientific Keys: The Key Muscles of Yoga Volume 1. Bandha Yoga. ISBN 978-1-60743-238-8. Swanson, Ann (2019). Science of Yoga: understand the anatomy and physiology to perfect your practice. DK Publishing. ISBN 978-1-4654-7935-8. Broad, William (2012). The Science of Yoga: The Risks and the Rewards. Simon & Schuster. ISBN 978-1-4516-4142-4. In a vivid narration from Sadhguru, we take a look at the being who introduced yoga to humankind, the Adiyogi, the first yogi.