Nadis carrying prana. Chakras along the central channel. Five winds governing different functions. Knots to be pierced. A coiled energy at the base of the spine. Five sheaths from the physical to the blissful.
This is the map the hatha texts work from, and almost everything in the practical repertoire only makes sense in terms of it. The bandhas seal prana. Pranayama directs it. The mudras address the loss of it. Take the map away and a great deal of the tradition becomes a set of unexplained physical habits.
The problem is how to talk about it, and this article is mostly about that — because the two available approaches are both bad, and there is a third.
The Two Bad Approaches
Approach one: assert it as fact. Chakras are energy centres, nadis carry life force, kundalini is real and rises. Taught this way, the framework acquires the status of physiology and is defended as such — which leads to claims that can be checked, and fail.
Approach two: translate it into physiology. Nadis become nerves. Chakras become endocrine glands or nerve plexuses. Ida and pingala become the parasympathetic and sympathetic nervous systems. Prana becomes oxygen, or bioelectricity.
The second approach is more common and it is worse, for three reasons.
It is not what the sources say. The texts describe channels that do not correspond to nerves and centres that do not correspond to glands. The mappings are twentieth-century additions, not translations.
It makes bad physiology. The chakra-to-endocrine-gland scheme, which is now nearly universal, does not survive contact with either the texts or endocrinology. It came largely from Theosophical writers in the early twentieth century — Western esotericists systematising Indian material for a Western audience — and it is repeated as though it were classical.
And it destroys the framework's own coherence. The subtle body model is internally consistent. Prana and apana move in opposite directions; the bandhas seal the exits; the mudras address the descent of nectar; sushumna is the aim. That logic is legible and interesting. Recoding it as anatomy leaves a set of arbitrary anatomical claims that are simply wrong, and loses the sense that anyone was thinking clearly.
The Third Approach
Report the framework on its own terms, and say that is what you are doing.
"The texts describe prana as moving upward and apana downward, and the bandhas as preventing their dispersal" is accurate, complete, and does not commit you to anything.
"Prana is your life force energy, which flows through your nadis" asserts.
"Prana is oxygen and nadis are nerves" translates, badly.
Why the first is not a cop-out. It lets you teach the practices coherently, explain why they take the form they do, and preserve the tradition's internal logic — while being straightforward about the epistemic status of the model. Students find this clarifying rather than deflating, in my experience of writing this material: they generally already suspect the endocrine mapping is doubtful, and being told plainly what is a framework and what is a finding is a relief.
It also protects the model from a critique it does not deserve. A map of felt experience is not refuted by the absence of anatomical structures, any more than a musical key signature is refuted by not appearing on an X-ray. Asserting the model as physiology invites exactly that refutation, and then loses.
And it is the discipline this whole site applies. The same argument, in the asana context, is in what asana actually means.
Two Different Models, Routinely Merged
Worth separating, because they come from different places and answer different questions.
The hatha and tantric subtle body — nadis, chakras, vayus, granthis, kundalini. This is the model the Hatha Yoga Pradipika and the tantric literature work from. Its concern is the movement and containment of prana, and its practices follow directly from that: seal the exits, reverse the flows, force prana into the central channel.
The Vedantic kosha model — the five sheaths, from annamaya at the physical level through to anandamaya. This comes from the Taittiriya Upanishad and belongs to a Vedantic analysis of what a person is, not to a tantric account of energy flow.
They are not the same system. One is a functional map used to justify practices. The other is a philosophical layering used to distinguish the self from what it is not. They are frequently presented as parts of one scheme, sometimes with the chakras assigned to sheaths, and that assignment is modern rather than textual.
Both are covered in this cluster and they are kept apart.
What the Model Contains
The vayus. Five principal winds — prana, apana, samana, udana, vyana — each governing a direction and a function, plus five minor ones. This is the most practically useful part of the framework, because the bandha and pranayama material assumes it directly.
The nadis. Channels through which prana moves. Three principal ones — ida, pingala, sushumna — and a traditional count of 72,000, which is a number worth examining rather than repeating.
The chakras. Centres along the central channel. The seven-chakra scheme now universal is one arrangement among several in the sources, and its history is more interesting than its modern presentation suggests.
The granthis. Three knots — brahma, vishnu, rudra — described as obstructions to be pierced.
Kundalini. A coiled energy at the base, whose rousing and ascent through sushumna is the stated aim of much of the hatha repertoire. It is also the area where modern claims and reported experiences most need careful handling.
The koshas. The five sheaths, from a different tradition, addressing a different question.
The Practices That Assume It
This is the practical reason the framework matters even to a reader sceptical of it.
Pranayama is not primarily a breathing exercise in the texts — it is the regulation of prana, with the breath as the handle. That is why retention is the point rather than an extra, as set out in kumbhaka.
The bandhas seal the exits so prana and apana meet rather than dispersing. Without the vayu model the three locks are three unrelated muscular actions, which is exactly how they get taught now — the argument in the three locks.
The mudras address the descent of nectar and the containment of prana, which is why a chin lock, an inversion and a tongue practice belong in one category — see mudra in hatha yoga.
Nadi shodhana is named for purifying the nadis, and alternate nostril work follows from the ida and pingala scheme rather than from anything about airflow.
Take the framework away and all four become arbitrary. Keeping it, and being clear about its status, is what lets the practices be taught as a system.
Where the Modern Version Came From
Worth tracing, because most of what a contemporary student encounters is not from the Indian sources.
Arthur Avalon — the pen name of Sir John Woodroffe, a British judge in Calcutta — published The Serpent Power in 1919, translating and commenting on tantric texts describing the chakras. It is the single most influential route by which this material reached English.
The Theosophical Society was working the same ground from a different direction. C.W. Leadbeater's The Chakras (1927) presented a systematised, colour-coded, seven-centre scheme with clairvoyant descriptions, and it is largely from here that the now-standard colours, the rainbow sequence and the endocrine correspondences come.
Neither is a classical source. Avalon is a translation with commentary; Leadbeater is an original synthesis by a Western esotericist.
And the twentieth-century additions kept coming — associations with psychology, with developmental stages, with crystals and sound frequencies, most of them post-1970 and none of them textual.
Why this matters practically. A student reading about chakras today is reading a layered document: a tantric core, a colonial-era translation, a Theosophical systematisation, and several decades of New Age accretion. Almost none of it is labelled, and the parts most confidently asserted are frequently the most recent.
Knowing the layers is what makes the material usable. You can report the tantric account accurately, note where the modern additions came from, and decline the ones that were invented in the twentieth century and presented as ancient.
What to Be Sceptical Of
Anatomical mappings, particularly chakras to endocrine glands. Modern, Western, and presented as ancient.
Diagnostic claims — that a blocked chakra causes a named condition, or that a symptom indicates an imbalance in a particular centre. These are not in the classical sources and they are not supported.
Kundalini as a health intervention, or as something to pursue quickly.
Confident colour, sound and crystal correspondences, most of which are twentieth-century systematisations rather than textual.
And anything that requires the framework to be literally true to work. A practice that only helps if prana exists is in a weaker position than one that helps regardless.
What This Cluster Covers
Guides are being added across three groups.
The winds: the five prana vayus, and the five minor ones.
The channels: ida, pingala and sushumna; and the 72,000 nadis and where that number comes from.
The map: the chakras historically and textually; the three granthis; kundalini as the texts claim it; an honest assessment of reported awakening symptoms; and the five koshas.
Each reports what the sources say, where the idea came from, and where the modern version has drifted — and each keeps the framework and the physiology apart.
Frequently Asked Questions
What is the subtle body in yoga?
A map of channels, centres and winds through which prana is described as moving. It is the framework the hatha texts work from, and the practices — pranayama, the bandhas, the mudras — only make sense in terms of it.
Is the subtle body real?
It is a coherent framework rather than an anatomical description. Asking whether nadis exist the way nerves exist misunderstands what kind of map it is, and asserting that they do invites a refutation the model does not need to face.
Are chakras the endocrine glands?
No. That mapping is a twentieth-century addition, coming largely from Theosophical writers systematising Indian material for a Western audience. It does not survive contact with either the texts or endocrinology, and it is repeated as though it were classical.
Are nadis nerves?
No. The texts describe channels that do not correspond to nerves, and the equivalence is modern. Prana is likewise not oxygen and ida and pingala are not the parasympathetic and sympathetic nervous systems.
Why does the subtle body matter if it isn't anatomy?
Because the practices assume it. Without the vayu model, the three bandhas are three unrelated muscular actions. Without ida and pingala, alternate nostril breathing has no rationale. The framework is what makes the repertoire a system.
Are the koshas part of the same system?
No. The five sheaths come from the Taittiriya Upanishad and belong to a Vedantic analysis of what a person is. The nadis, chakras and kundalini belong to the hatha and tantric account of energy flow. They are frequently merged and they answer different questions.
How should a teacher talk about this material?
Report it as the framework's own account and say that is what you are doing. That preserves the tradition's internal logic, lets the practices be taught coherently, and does not commit anyone to claims that can fail.
What should I be sceptical of?
Anatomical mappings, diagnostic claims about blocked chakras causing named conditions, kundalini presented as a health intervention, and confident colour or crystal correspondences. None of these is in the classical sources.
Where should I start?
The five prana vayus, because the bandha and pranayama material assumes them directly, and understanding them makes the practices you may already be doing legible.
A Map, Read as a Map
The subtle body is not anatomy and it is not nonsense. It is a coherent, internally consistent framework that a body of practice was built on, and it can be reported accurately without being either asserted or translated. Doing that is more work than either alternative, and it is the only approach that leaves both the tradition and the physiology intact.
Rohit Yoga Academy's residential 200-hour Yoga Teacher Training in Swargashram, Rishikesh teaches the subtle body material from the texts, with the framework and the anatomy kept apart, in groups capped at fifteen.