The Hindu-Yogi Science of Breath (1903) is a practical and philosophical guide to the ancient yogic art of pranayama-the science of controlling life energy through conscious breathing. Written under the pen name Yogi Ramacharaka by American author William Walker Atkinson, the book introduces Western readers to Eastern wisdom at a time when yoga was still largely unknown outside India.

The text explains that breath is far more than a simple physiological function: it is the key to harnessing prana, the vital force that animates the body and mind. Yogi Ramacharaka details the anatomy of breathing, the relationship between air, nervous energy, and vitality, and how improper breathing leads to fatigue, anxiety, and weakened health.

Step by step, he outlines methods for deep, rhythmic breathing and specialized exercises aimed at increasing energy, calming the mind, and enhancing mental focus. Alongside practical instruction, the book also explores the spiritual dimension of breath, describing it as a bridge between the physical self and higher states of consciousness.

Accessible and systematic, The Hindu-Yogi Science of Breath became a foundational text for early yoga enthusiasts and remains a classic introduction to breathwork, blending Eastern philosophy with clear, actionable techniques for health, energy, and spiritual growth.