The eight limbs
Aṣṭāṅga — Sanskrit aṣṭa (eight) plus aṅga (limb) — is the architecture into which Patañjali's [Yoga Sūtras](lexicon:yoga-sutras), compiled in the early centuries CE, compress the practice of classical yoga. The eight, in the order the text presents them, run: yama (five external restraints, beginning with *ahiṃsā* — non-harming — and including satya, asteya, brahmacarya and aparigraha); niyama (five internal disciplines: śauca, santoṣa, *tapas*, svādhyāya and Īśvara-praṇidhāna); āsana (the steady posture in which the rest of the practice can be sustained); prāṇāyāma (the disciplined regulation of the breath and the vital energy it carries); pratyāhāra (the withdrawal of the senses from their ordinary objects); dhāraṇā (concentration on a single point); dhyāna (the sustained meditation that arises when concentration stabilises); and samādhi (the absorption in which subject and object cease to be distinguishable). The last three Patañjali groups together as *saṁyama*, the inner work proper, and treats as a single graded continuum rather than as three discrete techniques.
How the limbs relate
The classical reading does not treat the eight as a strict sequence in calendar time. The text's claim is that the limbs support each other and that the path begins wherever the practitioner can begin — the householder who can hold the yamas but cannot sit for an hour in āsana is not disqualified from working the limbs she can work, and the disciplined sitter who has not done the ethical work will find the inner limbs ungrounded. What the sequence does name is a structural order of dependence. The yamas and niyamas are pitched as the floor: the practitioner's conduct toward what is not herself and toward herself respectively, treated as the ethical and dispositional precondition without which the technical limbs produce only technique without ground. Āsana and prāṇāyāma form the second pair: the body settled enough and the breath disciplined enough that attention has somewhere to rest. Pratyāhāra is the bridge between the outer and inner limbs — the moment at which the senses, no longer answering to their ordinary objects, become available for the inward turn that the last three limbs work. The three inner limbs — dhāraṇā, dhyāna, samādhi — are the limbs the rest of the path has been preparing. The Sūtras' operative claim is yogaś cittavṛtti-nirodhaḥ, that yoga is the cessation of the modifications of mind-stuff, and that those modifications still when the prior limbs have done their work; absorption is then the natural result rather than a state to be produced by effort at the inner stage alone.
Where to encounter it
Sadhguru's *Inner Engineering: A Yogi's Guide to Joy* is the contemporary entry into the eight-limbed framework most likely to reach the Western reader. The book treats the yamas, the niyamas and the inner limbs as a single working curriculum rather than as a historical text to be studied, and grounds them in the Śaiva yogic stream of southern India that runs in parallel to the Sūtra commentary tradition. The Inner Engineering Online course is the practice-side companion — kriyā-derived inner techniques that operate the prāṇāyāma, pratyāhāra and dhāraṇā limbs without naming them in Sanskrit. Sadhguru's longer-form lectures, including the talk on disability and spiritual practice and the talk on unlocking the mind's full potential, make the citta-vṛtti-nirodhaḥ claim accessible without the technical apparatus: the operative move in each case is the settling of mental activity into the steadier ground that the Sūtras call yoga in the first place. Paramahansa Yogananda's *Autobiography of a Yogi* carries the kriyā lineage of the early twentieth century — a householder transmission of disciplined inner technique — that treats Patañjali's eight-limbed scheme as the operating system on which its more esoteric practices run. The modern Western reception of the path's posture-and-breath limbs in clinical form appears in Jon Kabat-Zinn's MBSR programme: formally a Buddhist-derived curriculum, but the body-scan and breath protocols are limbs three and four of aṣṭāṅga extracted from the Indian frame and refigured as secular attention training.
What it isn't
Aṣṭāṅga is not the Ashtanga Vinyāsa of the modern Western yoga studio. The latter is a postural system codified by K. Pattabhi Jois in the mid-twentieth century from his teacher Krishnamacharya's Mysore-style practice; it took the Sanskrit aṣṭāṅga as its name and works almost entirely inside the third limb. The classical eight have all but disappeared from the appropriation, and the conflation is the single most common misuse of the term in English. Nor is aṣṭāṅga the Buddhist Noble Eightfold Path — a separate eight in a different tradition, organised around right view, intention, speech, action, livelihood, effort, mindfulness and concentration, and ending in nirvāṇa rather than in kaivalya. The two paths share the number and a recognisable family resemblance in the working logic — ethical conduct as the floor for contemplative discipline — but their metaphysics differ (Patañjali's Sānkhya dualism of puruṣa and prakṛti versus the Buddhist anattā analysis) and the formulations are not interchangeable. Finally, the eight are not a moral checklist. The yamas and niyamas describe the conduct that produces the conditions in which the technical limbs become workable; they are clinical observations rather than ethical edicts. To take the path seriously, the classical commentary is insistent, is to read it as a single integrated discipline in which the eight limbs are eight aspects of one yoke.
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