The Eight Limbs of Yoga

In the West, “yoga” usually means a mat and a pose. In Patañjali’s Yoga Sutras it means eight limbs, and the pose is only the third one.

Somewhere between the second century BCE and the fourth century CE — scholars argue the exact window, not the text — a sage named Patañjali compiled 196 short aphorisms called the Yoga Sutras. They are the foundational text of what’s now called classical yoga, or Raja Yoga: the “royal path.” The single sutra everyone eventually runs into, II.29, lists eight limbs, in this order:

अष्टांग

Aṣṭāṅga · ash-TAHNG-ga

Literally “eight limbs” (aṣṣau = eight, aṅga = limb). Not eight steps to complete and leave behind — eight limbs of one body, meant to be practiced together and reinforce each other.

The word most people know — “asana” — is limb three of eight. It gets a paragraph below like everything else. That’s the first useful correction this text makes to the gym-studio version of yoga: the postures are one-eighth of the system, and originally they meant something much narrower than a vinyasa flow.

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The five outer limbs (bahiraṅga)

The first five limbs are called “external” because they shape behavior, body, and attention — the observable layer, before anything turns inward.

Yama — restraint

Five ethical vows aimed outward, at how you treat others: ahiṃsā (non-harming), satya (truthfulness), asteya (non-stealing), brahmacarya (right use of vital energy, often read as sexual restraint), aparigraha (non-grasping).

Niyama — observance

Five disciplines aimed inward, at the self: śauca (cleanliness), santoṣa (contentment), tapas (disciplined effort), svādhyāya (self-study), īśvara-praṇidhāna (surrender to something larger than the self).

Āsana — seat

Sutra II.46 defines it in three words: sthira sukham āsanam — a seat that is steady and comfortable. Originally one seated posture for meditation, not a sequence of poses. The hundreds of named postures came many centuries later, from the Hatha yoga tradition.

Prāṇāyāma — breath extension

Regulation of the breath — inhale, exhale, and the retention between them — once the seat is stable. The aim is a settled nervous system, not lung capacity for its own sake.

Pratyāhāra — sense withdrawal

Drawing attention back from the five senses, the way a turtle pulls its limbs into its shell. The hinge limb: the last of the outer five, and the condition for the inner three.

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The three inner limbs (antaraṅga)

The last three limbs are so tightly linked that Patañjali gives them a joint name — saṃyama, “binding together” — and treats them as one continuous deepening rather than three separate skills.

Dhāraṇā — concentration

Binding attention to one object — the breath, a point, a mantra — and holding it there. The seed from which the next two limbs grow.

Dhyāna — meditation

Concentration that has become continuous — an unbroken flow of attention toward the object, rather than repeated returns to it. This is the sutra source of the word that traveled through Chinese ch'an into Japanese zen.

Samādhi — absorption

The object of meditation fills awareness so completely that the sense of a separate observer meditating on it falls away. The stated end of the whole system — not a ninth thing added on, but what the other seven were clearing space for.

“Yama, niyama, āsana, prāṇāyāma, pratyāhāra, dhāraṇā, dhyāna, samādhi — these are the eight limbs of yoga.” — Yoga Sutras of Patañjali, II.29

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Where the modern class stops

Studio yoga in the West is almost entirely limb three, sometimes with a little of limb four. That’s not a criticism — a steady, comfortable body and a regulated breath are real and load-bearing on their own. But it’s worth naming clearly, because the Sutras themselves don’t treat asana as separable from the other seven. The ethical limbs come first for a reason: Patañjali’s system assumes a mind stirred up by harm done or received can’t hold steady concentration, so yama and niyama aren’t a moral preamble, they’re a precondition.

It’s also worth being precise about which yoga is which. The book I’ve been working through this year, Advanced Hatha Yoga, belongs to a different and much later tradition — Hatha texts like the Hatha Yoga Pradipika (roughly 15th century CE) show up more than a thousand years after Patañjali, and they explicitly position themselves as preparation for the older system: purify and strengthen the body first, then the raja yoga described above becomes possible. My own pranayama-and-posture practice sits inside limbs three and four of Patañjali’s much older map — useful to know, since it means the physical practice was never meant to be the whole system, just the entry to it.

The counterintuitive part: the limb most people skip — pratyahara, withdrawing from the senses — is the one the Sutras treat as the actual hinge. Without it, concentration has nothing steady to rest on, because attention is still being pulled outward by whatever the senses report. Asana and pranayama prepare the body to sit still. Pratyahara is what lets the mind stop chasing what the body reports back.