Cardiac Coherence Breathing: The 5-5 Method Step by Step

By Bathilde Rocchia, creator of BreathInU. Published .

What cardiac coherence is

Cardiac coherence is slow, even breathing at about 6 breaths per minute: 5 seconds in, 5 seconds out, for around 5 minutes. No holds, no counting tricks, no special posture.

The name comes from what happens to your heart rate. It naturally speeds up a little when you breathe in and slows down when you breathe out. At around 6 breaths per minute, those rises and falls become large and regular, like a smooth wave. Researchers call this resonance, and it is the basis of heart rate variability (HRV) biofeedback.

It is the simplest technique on this site, and one of the easiest to keep as a daily habit.

How to practice

  1. Sit upright, feet on the floor, shoulders relaxed. Lying down works too, but you may fall asleep.
  2. Breathe out once fully to start.
  3. Inhale gently through the nose for 5 seconds. Let the belly expand first.
  4. Exhale for 5 seconds, through the nose or softly through the mouth.
  5. Repeat for 5 minutes. That is 30 breaths.

The breaths should be slow, not big. If you feel lightheaded, you are moving too much air: keep the same rhythm with a smaller breath.

If 5 seconds feels short, try 6 in and 6 out (5 breaths per minute). If it feels too long, start at 4 and 4 and lengthen over a few days. The exact count matters less than a slow, steady rhythm.

The 365 routine

A popular way to make it a habit, especially in France, is the “365” method: 3 times a day, 6 breaths per minute, for 5 minutes, every day of the year.

In practice:

  • Morning, before checking messages
  • Midday, before lunch or between two meetings
  • Late afternoon or evening, to close the workday

If three sessions is too much, one session a day is still useful. Missing a day is not a reason to stop.

What it can and cannot do

Slow breathing around 6 breaths per minute increases heart rate variability during practice, and studies link regular slow breathing with feeling calmer and less anxious. Most studies are small and short, so treat it as a reliable calming tool, not a cure.

What people usually notice:

  • A calmer, slower feeling after 3 to 5 minutes
  • Easier transition between a stressful task and the next one
  • An evening routine that helps the body wind down

What it is not: a heart test, a treatment for a heart condition, or a replacement for care if you have anxiety that disrupts your life. Despite the name, you do not need a heart rate monitor to practice it.

Cardiac coherence vs other techniques

  • Box breathing adds holds. It is better when you need focus under pressure. Guide: box breathing.
  • 4-6 breathing makes the exhale longer than the inhale, a stronger downshift for the evening. Guide: 4-6 breathing.
  • Cardiac coherence keeps both halves equal. It is the most neutral of the three, good at any time of day.

If you are new to breathing exercises, start with cardiac coherence. It has no holds and nothing to get wrong.

Common mistakes

  • Breathing too deeply, which can cause dizziness
  • Forcing the exhale through tight lips
  • Watching a clock instead of following a guide
  • Doing 20 minutes once a week instead of 5 minutes most days

How to do it in BreathInU

In BreathInU, cardiac coherence is the Simple Breath exercise. A circle grows as you breathe in and shrinks as you breathe out, with a soft sound cue (a crystal bowl, a Tibetan bowl, or silence) at each change, so you can close your eyes.

By default it runs 5 short breaths of 4 seconds each way, a quick 40-second reset. For a full session, open the settings before you start and set the breathing duration to 5 seconds and the number of breaths to 30. The app keeps your last settings for next time, and once you have completed the same number of breaths three times in a row, it adds one more.

On iPhone, a home screen widget and your streak help you keep the 365 rhythm.

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