Alternate Nostril Breathing (Nadi Shodhana)

The pattern

Left In for 4 seconds, hold for 4, right out for 4, right in for 4, hold for 4, then left out for 4. 12 rounds take about 5 minutes.

1. 4sLeft In
2. 4sHold
3. 4sRight Out
4. 4sRight In
5. 4sHold
6. 4sLeft Out

Best for

Focus. Nadi Shodhana — yogic balancing breath that harmonizes left and right brain.

How to do it

1. Close right nostril, inhale left 4s.
2. Close both, hold 4s.
3. Release right, exhale 4s.
4. Inhale right 4s, close, hold 4s, exhale left.
5. Continue for 5–10 minutes (~12 rounds).

Studies show 15–20 min for max cognitive benefit, but 5 min is effective.

How long and how often

One full session as timed here is about 5 minutes (12 rounds).

What the research says

Known as Nadi Shodhana ("channel purification") in yoga, alternate nostril breathing works by balancing activity between the left and right hemispheres of the brain. Each nostril is linked to the opposite brain hemisphere through the autonomic nervous system—the right nostril activates the sympathetic (energizing) side, while the left activates the parasympathetic (calming) side. By alternating, you bring both into equilibrium. Studies show this practice lowers heart rate, reduces blood pressure, improves respiratory function, and enhances performance on tasks requiring sustained attention and fine motor coordination.

Who should be careful

This is a low-intensity technique and safe for most people, but:

• Stop if you feel dizzy, breathless or anxious, and let your breath return to normal. Breathing exercises should not feel like effort.
• If you have a respiratory condition such as asthma or COPD, or a heart condition, check with your clinician before changing how you breathe on purpose.
• If slowing your breath makes anxiety worse rather than better — which happens to some people — a different technique is a better fit than pushing through this one.

Related techniques

• □ Box Breathing Equal-ratio breathing used by Navy SEALs to stay calm under pressure.
• 🎯 Tactical Breathing Military combat breathing — rapid reset for high-stress peak performance.
• ☾ 4-7-8 Relaxation Dr. Andrew Weil’s natural tranquilizer for the nervous system.
• ❄ Wim Hof Method Power breathing with retention — boosts energy, focus, and resilience.