Sitali (cooling breath)

Inhale through a curled tongue or between the teeth to cool and calm a heated nervous system.

Why it works

Sitali passes air over the wet, cool surface of the curled tongue (or teeth), producing a cooler-than-body-temperature airstream that activates thermal receptors in the nasal and pharyngeal mucosa. Cooling receptors link to the parasympathetic system and to hypothalamic temperature regulation. The forced slow inhalation also extends breath duration, activating the vagal brake in the same way as other slow-breathing practices.

How to do it

1. Curl the tongue lengthwise (a genetic ability; if you cannot curl your tongue, perform sitkari — inhale through the teeth with a slight hiss).
2. Inhale slowly through the curled tongue for 4–6 counts, feeling the cool air.
3. Close the mouth and exhale through the nose for 6–8 counts.
4. Repeat 8–10 rounds.
5. Best done in warm environments or when you feel physically hot or emotionally "heated."

Evidence

Sitali is described in classical pranayama texts as a cooling practice; the thermal receptor mechanism is physiologically plausible. Controlled research on sitali specifically is very limited. The extended inhale-and-exhale pattern shares evidence with other slow-breathing work. (mechanistic)

Very little independent peer-reviewed research targets sitali as an isolated practice. Its benefits are plausible from mechanism but not directly demonstrated in controlled trials. Avoid in cold, dry, or polluted environments where cool, unfiltered air is not desirable.

Common mistake

Practicing sitali in cold weather — the practice is specifically for internal and environmental heat; inhaling cold, dry air through the mouth without nasal warming can irritate airways.