Posture is steady and comfortable.

The verse

Sthira-sukham āsanam — "posture is steady and comfortable." This is one of the shortest sutras in Patanjali's text, just three words, yet it functions as a complete technical definition. Two qualities are named, and only two: sthira, steadiness or firmness, and sukham, ease or comfortableness. Notice what is absent — there is no mention of shape, no naming of a pose, no instruction about legs, spine, or hands. Patanjali is defining a category by its felt qualities rather than by its outward form.

Sthira and sukha as a pair

Sthira comes from a root meaning "to stand firm," and in Patanjali's broader vocabulary it points to a kind of rootedness that does not waver under ordinary disturbance. Sukha is often translated "comfortable," but its older sense is closer to "having a good space" — an ease that is spacious rather than merely relaxed or slack. The commentarial tradition, including Vyasa's Bhashya on this sutra, treats the two as complementary rather than opposed: a posture that is only firm but strained is not yet asana in Patanjali's sense, and a posture that is only comfortable but collapsed or unstable is not asana either. The definition asks for both at once.

Why the definition stays general

This generality is deliberate and consistent with the aim of the chapter, which is preparing the body and attention for meditation, not cataloguing physical exercises. Later hatha yoga literature takes up the word asana and multiplies it into many named forms, each described in physical detail, but that expansion happens centuries after Patanjali and belongs to a different textual tradition with different aims. In the Yoga Sutra itself, asana names one seated condition, evaluated by two qualities, in service of the limbs of practice that follow it — pranayama, withdrawal of the senses, and the more internal stages of concentration.

Reading it as one sutra among many

It is worth noting where this verse sits: it is the third mention of asana as one of the eight limbs (ashtanga) listed earlier in the second chapter, and it is immediately followed by two further sutras that explain how such steadiness and ease are achieved, and what follows from mastering them. Reading 2.46 in isolation can make it sound like a throwaway line about sitting up straight; reading it alongside 2.47 and 2.48 shows it opening a short, carefully built argument about the relationship between the body and the mind's readiness for deeper practice.

A note on the commentarial tradition

Vyasa's Bhashya, the oldest surviving commentary on the Yoga Sutra, glosses this definition by observing that a posture becomes asana precisely at the point where the practitioner stops noticing the body as an obstacle — where sitting no longer competes for attention with the object of concentration. Later translators and commentators, including Edwin Bryant in his annotated translation and B.K.S. Iyengar in his writings on the sutras, return again and again to this same point: the definition is functional, not aesthetic. It describes what a posture must do for meditation to proceed, not what it must look like from the outside. This functional emphasis is easy to lose sight of when the word asana is used today mostly to describe a visual form, but it is central to how the verse was understood within its own tradition.

Using the definition as a daily check

Rather than a checklist of physical positions, treat sthira-sukham as two questions you can ask about whatever position you take for practice, whether that is a formal cross-legged seat, a chair, or a kneeling posture with support. First: is this stable enough that I am not making small corrections or fidgeting every few breaths? Second: is this comfortable enough that I am not silently negotiating with discomfort? If either answer is no, the traditional guidance is not to force it, but to adjust — a cushion under the hips, a block under the knees, a wall at the back — until both are reasonably true.

A short concrete practice

Sit for five minutes using this test directly. Take your seat, however you sit for meditation, and spend the first minute simply noticing where you feel unsteady (swaying, gripping, tension in the shoulders holding you up) and where you feel discomfort (pressure in the ankles, an ache in the low back). Adjust once, deliberately, addressing one of these — height, support, or alignment — rather than trying to fix everything. Then sit for the remaining four minutes without further adjustment, simply noticing whether the two qualities, steadiness and ease, are more present than when you began. Over weeks, this practice of adjusting toward sthira-sukham rather than toward a particular look is what the tradition points to as the real cultivation of asana in Patanjali's sense.

Why the order matters

This groundwork is not incidental. The two verses that follow explain that pranayama depends on this steadiness first being established, so time spent finding a genuinely steady and comfortable seat is not preliminary throat-clearing — it is the condition the rest of the practice depends on.

The modern conflation

The most common misreading takes today's word "asana," which in casual usage means any of hundreds of named physical postures from modern practice, and reads that entire vocabulary back into this one sutra, as though Patanjali were offering a preview of a large physical system. He is not. This sutra defines a single condition — a seated position that is steady and comfortable — and says nothing about arm balances, inversions, standing sequences, or the countless named forms that appear centuries later in hatha yoga texts.

Confusing achievement with ease

A related misreading treats "comfortable" as meaning "difficult to achieve," as if the highest asana were the one requiring the most flexibility or strength. The verse points the opposite direction: sukha describes ease, not accomplishment. A posture requiring visible strain to hold is, by the sutra's own definition, not yet functioning as asana, regardless of how demanding or advanced it looks.

The corrective

It is more accurate to present this verse as it stands: a spare, two-word definition of a meditative seat, meant to be tested against one's own body and breath rather than measured against any external standard of shape or difficulty.