Cardiac Coherence 365 (the 3-6-5 Method)

How to do it

1. Pick three fixed moments in your day, for example on waking, before lunch and in the late afternoon.
2. Sit with your back straight and your feet flat on the floor, or lie down.
3. Breathe in gently through your nose for 5 seconds.
4. Breathe out slowly for 5 seconds. No pause at the top or the bottom.
5. Keep going for 5 minutes, about 30 breaths. Follow a pacer instead of counting.
6. Let your breathing return to normal and get on with your day. Repeat at your next moment.

Benefits

• Steadier in five minutes

  At six breaths a minute your heart rate rises and falls in large, even waves^[4], and slow breathing raises the heart rate variability linked to rest^[5].

• Calm that keeps coming back

  Three short sessions spread through the day bring you back to a steady state before stress builds up.

• Calm without drowsiness

  In slow-breathing studies, people reported more alertness and vigor along with more relaxation^[6].

• Nothing to learn but a rhythm

  There are no holds and nothing to adjust. You can start today.

What the research says

The breathing itself is well studied. At about six breaths a minute, breathing lines up with the body's blood-pressure reflex, and heart rate rises and falls with each breath far more than usual^[4]. A 2022 meta-analysis of 223 studies found that slow breathing raised vagally mediated heart rate variability during sessions, with smaller increases right after a single session and after multi-session programs^[5].

A 2018 systematic review of 15 studies linked slow breathing to more comfort, relaxation and alertness, and to less anxiety, anger and confusion^[6].

The evidence is for slow breathing in general. The 3-6-5 schedule itself, and the popular claim that each session's calm lasts for hours, come from the method's teachers rather than from trials of the protocol.

What 3-6-5 means

O'Hare's book is called Cohérence cardiaque 3.6.5, and its three numbers are the whole method^[1]:

• 3: three sessions a day, spread out, for example morning, midday and late afternoon.
• 6: six breaths a minute, which is 5 seconds in and 5 seconds out.
• 5: five minutes per session, about 30 breaths.

Cardiac coherence 365 vs HeartMath

Cardiac coherence grew out of HeartMath research in California and reached a wide French audience through psychiatrist David Servan-Schreiber's 2003 book Guérir^[2]. HeartMath's own Quick Coherence technique is different: about a minute of attention on the heart area and slower breathing while you deliberately feel appreciation or care^[3]. The 3-6-5 method keeps only the pace and the schedule.

Tips

• Tie each session to something you already do: your first coffee, lunch, the end of the workday.
• Start with one session a day at the same time. Add the second and third once the first is automatic.
• Keep each breath light and moderate. Filling up on every breath for five minutes is the most common mistake.
• If you miss a session, just do the next one. The habit matters more than a perfect record.

Related exercises

• Coherent BreathingFive seconds in, five seconds out, no holds. An even breath that steadies your heart and clears your head.
• Find Your PaceResonance Frequency BreathingSlow, even breathing at the pace that makes your heart rate rise and fall the most.
• Stress Relief BreathingA long, slow breath in, a soft breath out, and a short pause that grows each round.