समं कायशिरोग्रीवं धारयन्नचलं स्थिरः | सम्प्रेक्ष्य नासिकाग्रं स्वं दिशश्चानवलोकयन् || १३ ||
samaṃ kāya-śiro-grīvaṃ dhārayann acalaṃ sthiraḥ samprekṣya nāsikāgraṃ svaṃ diśaś cānavalokayan
samam—straight; kāya—body; śiraḥ—head; grīvam—neck; dhārayan—holding; acalam—unmoving; sthiraḥ—still; samprekṣya—looking; nāsikā-agram—at the tip of the nose; svam—own; diśaḥ—in all directions; ca—also; anavalokayan—not looking.
“Holding the body, head, and neck erect and still, gazing at the tip of the nose, without looking in other directions —”
The instruction to keep the body, head, and neck erect (samam) is both physiological and metaphorical. Physiologically, an erect spine facilitates the free movement of prana and prevents drowsiness. Metaphorically, it represents the upright dignity of the serious seeker. The 'gaze at the tip of the nose' is understood by most commentators as a technique to prevent the eyes from wandering outward, turning the attention inward. It also gently steadies the breath.
When you sit for meditation today, take a moment to align your body: lift the crown of your head, lengthen the back of your neck, keep the spine gently erect. Notice how this simple postural adjustment immediately creates a quality of alertness and dignity — you are not slouching into sleep, but sitting into wakefulness.