Anulom Vilom, alternate nostril breathing, is the modern household name for the technique the classical texts call Nadi Shodhana, channel-cleansing breath. It is described in the Hatha Yoga Pradipika 2.7–10 as the preliminary pranayama practice for any aspirant beginning sustained breath work, prescribed for purifying the ida and pingala channels and balancing the flow before deeper kumbhakas are attempted. The basic technique uses the right thumb and ring finger to alternately close one nostril at a time, with a typical ratio of 1:1 for inhale and exhale, building toward 1:4:2 (inhale, retain, exhale) over months. Twelve rounds takes about 15 minutes.
What the technique is and what the names mean
The Sanskrit nadi means “channel” and shodhana means “cleansing”. In the subtle-body model of hatha yoga, the body has 72,000 nadis, of which three matter most: ida (left, lunar, cooling), pingala (right, solar, heating), and sushumna (central, neutral). Alternate nostril breathing is the technique for clearing ida and pingala so that prana can eventually flow in sushumna. The modern Hindi term Anulom Vilom translates roughly as “with the grain, against the grain”, a reference to the alternation between nostrils.
In strict Bihar School of Yoga usage, Anulom Vilom refers to the version without breath retention and Nadi Shodhana to the version with retention. In most other modern schools and in household practice the names are used interchangeably.
The hand position (Vishnu mudra) and the basic round
- Sit upright in Sukhasana, Siddhasana or on a chair if the floor is uncomfortable.
- Form Vishnu mudra in the right hand: fold the index and middle fingers into the palm; the thumb, ring finger and little finger remain extended.
- The right thumb closes the right nostril; the right ring finger closes the left nostril.
- Close the right nostril with the thumb. Inhale slowly through the left nostril for a count of four.
- Close the left nostril with the ring finger, release the thumb. Exhale through the right nostril for a count of four.
- Inhale through the right nostril for a count of four.
- Close the right nostril, release the ring finger. Exhale through the left nostril for a count of four.
- This is one full round. Begin with 5 rounds, build to 12.
Left-handed practitioners can use the left hand in the mirror position; this is acceptable in modern practice although the right hand is the classical default. Those who find the hand position tiring can use Nasagra mudra (thumb on right nostril, ring and little finger on left, index and middle resting at the third-eye point).
The progression with retention
After four to six weeks of the simple 1:1 ratio, the practitioner can introduce antar kumbhaka (internal retention after inhalation). The Hatha Yoga Pradipika 2.50 prescribes a ratio of 1:4:2 (inhale:retain:exhale) for the mature practice, but this is an aspirational ratio reached only after years of work. Practical progression:
- Weeks 1–6: 4:0:4 (no retention).
- Weeks 6–12: 4:2:4.
- Months 3–6: 4:4:4 (equal ratio).
- Months 6+: 4:8:8 or 4:16:8, working toward 4:16:8 (the classical 1:4:2) only when the practitioner can hold the ratio without strain or breaking the count.
The cue across all schools: if the count breaks, if the breath becomes ragged on the next inhalation, the ratio is too aggressive and should be backed off.
Documented effects
Alternate nostril breathing is one of the better-studied pranayama techniques. Across published studies the consistent findings are:
- Increase in heart rate variability (HRV) within a single session and over weeks of regular practice.
- Decrease in resting heart rate and blood pressure in modestly hypertensive populations.
- Improvement in attention tasks immediately after practice.
- Documented effects on autonomic balance, broadly toward parasympathetic activation.
These effects are real but modest, the kind of intervention that matters as a daily habit rather than a once-off cure. The classical claim, that the practice purifies the nadis and prepares the body for higher pranayama, is consistent with the documented effects in modern terms: a balanced autonomic nervous system, a steadier respiratory rhythm, a calmer baseline state.
When to practise and what to avoid
The classical timing: brahma muhurta, the 96-minute window before sunrise, is the preferred slot. Practically, any quiet morning slot before breakfast works. Evening practice (before dinner) is the secondary slot. The contraindications are mild compared to Bhastrika or Kapalbhati:
- Heavy nasal congestion makes the technique frustrating and ineffective; clear the nose first with neti or warm water.
- Severe hypertension should avoid the retention phase; the simple 1:1 alternation is safe.
- Pregnancy and active illness are generally fine with the simple version but should skip the retentions.
For what it’s worth, Anulom Vilom is the pranayama technique most worth recommending to a complete beginner. It is forgiving (no forceful breath, no aggressive retentions in the beginner version), it is well-studied, and it serves as a reliable on-ramp to the more demanding techniques like Bhastrika.
Common questions
How long until results are noticeable?
Subjective effects, calmer mind, slower breath, are noticeable within the first session. Measurable physiological effects, lower resting heart rate, improved HRV, take four to eight weeks of daily practice in most studies. Permanent changes to baseline autonomic tone take months. The pattern is the same as any other long-term self-regulation practice.
Can it be done lying down?
Seated upright is the standard. Lying down changes the diaphragm’s mechanics and makes the breath shallower; the technique works less well. If sitting on the floor is uncomfortable, a chair with the feet flat and the spine erect is acceptable. Lying down is reserved for restorative practices like Savasana or yoga nidra, not for active pranayama.
Is the hand position essential?
The Vishnu mudra hand position is the classical convention and provides reliable nostril control. Practical equivalents (Nasagra mudra) are accepted in most schools. Some advanced practitioners learn to alternate nostrils mentally, without the hand position, by directing the breath through the inner channels; this is a much later refinement and not a starting point.
Which nostril to start with?
The classical instruction is to start with the left nostril (the lunar, cooling channel). Some Bihar School protocols modify this by starting with whichever nostril is currently more open, to even out the flow before counting begins. Either convention is acceptable; the left-first version is the standard and the more commonly taught.
One limitation worth noting
Studies on alternate nostril breathing are small, heterogeneous, and short. The effect sizes are real but not large; the practice is best treated as one piece of a larger daily routine (good sleep, movement, diet) rather than a standalone intervention. The classical claims about nadi purification, balancing ida and pingala, eventually triggering sushumna flow, are tradition-internal claims; they parallel the modern findings on autonomic balance but are not literally the same thing.
See the Wikipedia entry on Nadi Shodhana for further background.
