Kurmasana

The Hatha Yoga Pradipika describes kurmasana as pressing the crossed ankles against the perineum and sitting steadily. It is a compact arrangement, everything folded toward the centre, and Svatmarama gives it in a single verse without attaching a claim to it. The Gheranda Samhita includes it among its thirty two and follows it immediately with a second form, the stretched tortoise, which is a different shape carrying the same animal's name.

Kurma is the tortoise, and in Indian religious literature the tortoise is not a neutral animal. It is the second avatar of Vishnu, who takes that form to bear the mountain on his back while the ocean is churned, and it appears in cosmological accounts as a support of the world. The manuals do not invoke any of that when they name the posture, and the atlas does not assert a connection the texts do not make.

What the texts do assume is a reader who already knows the animal's defining action. A tortoise is the creature that withdraws. The posture is the body brought in and closed, ankles at the centre, limbs gathered, and the resemblance the compilers had in mind is almost certainly that rather than the shell. Both surviving manuals carry the posture, which places it in the shared stock behind the corpus rather than among the later additions.

The tortoise carries a settled meaning in Indian religious writing that predates the hatha manuals by many centuries. In the second chapter of the Bhagavad Gita, the person of steady wisdom is described as one who draws the senses back from their objects as a tortoise draws its limbs into its shell. The comparison is made about the mind, not about a posture, and the Gita is not a manual of physical practice.

That image is the standard figure for what the yoga literature calls the withdrawal of the senses, the stage in which attention is detached from what the eyes and ears are reporting before concentration proper begins. It appears across the tradition, and a reader of the hatha manuals in the fifteenth or seventeenth century would have met it long before meeting a posture list.

The atlas records the association without asserting that the compilers intended it. Neither the Hatha Yoga Pradipika nor the Gheranda Samhita glosses kurmasana in those terms; both simply describe the arrangement and move on. What can be said is that the name places the posture inside a field of meaning the tradition had already established, and that a practitioner sitting drawn in and still, with the senses turned inward, would have found the animal apt without needing to be told. Where the texts are silent, the atlas marks the silence rather than filling it.