The document provides a historical overview of yoga from ancient times to modern day. It discusses the Vedic origins of yoga concepts like prana, tapas, and the five prana vayus. Hatha yoga developed in the medieval period combining practices from Tantra and earlier traditions. Key texts like the Yoga Sutras, Hatha Yoga Pradipika, and others systematized yoga philosophy and practices. Kundalini awakening, the reversal of prana and apana vayus, and the relationship between nadis, chakras and the subtle body are important concepts in yoga's development.