Yoga (योग), derived from the Sanskrit root "yuj" meaning "to yoke" or "to unite," is the ancient Indian science of reuniting individual consciousness (Atman) with universal consciousness (Brahman). Far beyond the physical posture practice (Asana) that the modern world has adopted, classical Yoga as codified by Maharishi Patanjali in the Yoga Sutras (circa 200 BCE) is an eight-limbed (Ashtanga) systematic discipline: Yama (ethical restraints), Niyama (observances), Asana (posture), Pranayama (breath control), Pratyahara (sense withdrawal), Dharana (concentration), Dhyana (meditation), and Samadhi (absorption). The Bhagavad Gita further describes four complementary pathways — Karma Yoga (selfless action), Bhakti Yoga (devotion), Jnana Yoga (knowledge), and Raja Yoga (meditation) — each suited to a different temperament.
What makes the Vedic approach to Yoga unique is its deep integration with sister sciences. Swar Gyan (Swara Yoga), documented in the Shiva Swarodaya, teaches practitioners to read the active nostril as a cosmic signal — determining the optimal time for meditation, eating, business, and travel. Pranayama directly regulates the three doshas (Vata, Pitta, Kapha) of Ayurveda, making breath control a medical as well as spiritual practice. The Chakra system maps seven energy centers along the spine that correspond to specific Navagraha (planetary) influences in Jyotish — for example, the Manipura (solar plexus) chakra is governed by Mars, while the Ajna (third eye) is linked to Saturn. Kundalini energy, dormant at the base of the spine, rises through these chakras during advanced Tantric practice, producing states of consciousness described in both the Hatha Yoga Pradipika and the Upanishadic traditions. This section explores all these dimensions of Yoga as an interconnected spiritual science.