What is Subtle body?
The subtle body (sūkṣma śarīra) is the energetic-anatomical layer Indian yoga, tantra, and Tibetan Buddhism take as the operative ground of practice. It consists of channels (nāḍī) along which life-energy (prāṇa) flows, focal points (chakras) where channels intersect, and concentrated drops (bindu). This is not a claim about anatomy in the medical sense. It is a map of the level at which yoga, tantra, and Vajrayāna are held to work.
Subtle body vs adjacent concepts
The subtle body is not the aura of New Age literature, nor the etheric body of late-nineteenth-century Theosophy. Both terms are downstream of the Indian model, translated into English under different choices. It is not a ghost-body that survives death intact. The schools that posit post-mortem continuity locate that continuity in the causal body, not the subtle. It is also not a clinical claim the medical literature has validated or invalidated. The serious lineages treat the model as an operative map rather than a metaphysical assertion. The question is the subtle body real matters less, in the traditions' own framing, than whether the practice produces the transformations the tradition describes.
The three-bodies model
Vedānta organises the question into three concentric śarīras. The sthūla śarīra is the gross physical body: the one the senses register and medicine treats. The sūkṣma śarīra is the subtle body: the energetic-and-cognitive layer contemplative practice works directly on. The kāraṇa śarīra is the causal body: the deepest layer, which carries the residue (saṃskāras) across embodiments in schools that posit rebirth. The koshas of the Taittirīya Upaniṣad — the prāṇa-maya, mano-maya and vijñāna-maya sheaths — enumerate the subtle body's inner layers. The kriyā lineage of Lahiri Mahasaya, transmitted to the West by Paramahansa Yogananda's *Autobiography of a Yogi*, takes the subtle body as the explicit operative ground of the practice.
Where to encounter it in the index
The most-present contemporary voice on the subtle body in the corpus is Sadhguru, whose Śaiva yogic lineage treats the prāṇic anatomy as the ground of the Shambhavi mahāmudrā kriyā. *Inner Engineering: A Yogi's Guide to Joy* introduces the framework in print. Inner Engineering Online is the long-form video course in which the kriyā is transmitted. Sadhguru on disability and spiritual practice and Sadhguru on unlocking the mind's full potential describe the same anatomy in single-talk format. Yogananda's *Autobiography of a Yogi* is the canonical Western entry into the kriyā lineage's subtle-body work. On the Buddhist side, Pema Chödrön's course on awakening compassion and her *When Things Fall Apart* transmit the Karma Kagyu register in which the Six Yogas of Nāropa completion-stage work sits as the technical background. Jon Kabat-Zinn's MBSR programme does not engage the subtle-body framework, but its body-scan and breath-attention practices cultivate the same quality of attention the framework was built to direct.
How the Vajrayāna inherits it
The Vajrayāna inherited a closely related but distinct architecture from the Indian anuttarayoga tantras. Three principal channels (rtsa gsum in Tibetan): avadhūti the central channel, lalanā the left, rasanā the right. Life-energy moves through them as rlung (winds). The drops (thig le) are the red and white bindus the Indian tantras locate at the navel and crown. Their movement through the central channel is the technical content of the gtum mo inner-heat yoga and the other completion-stage practices in the Six Yogas of Nāropa. The generation stage of deity yoga builds the visualisation. The completion stage dissolves it into this subtle anatomy and works directly with channels, winds and drops.
