in:ex 1:2
Extended exhale
Any ratio where exhale is at least twice the inhale. The mechanism behind why so many techniques work. Configurable.
The protocol
Inhale for a chosen number of seconds. Exhale for at least twice as long. No holds. In the app, the inhale dial covers two to six seconds; the exhale covers four to twelve.
Start at 4 in, 6 out. Move to 4 in, 8 out once the first ratio feels effortless. The most calming ratio most adults can sustain without strain is roughly 4 in, 8 out — and that's also exactly the exhale half of 4-7-8 without the retention.
Breathe through the nose if you can; through the mouth if the nasal channel feels obstructed. Don't force the exhale to its absolute end — leave a small reserve and inhale before you've emptied completely.
Best for
When you know which direction you need to move. Customizable practice.
Why it works
Extended exhale is the mechanism behind 4-7-8, behind the physiological sigh, behind ujjayi pranayama, and behind half the breathing exercises taught in yoga, meditation apps, and therapy practices.
The reason is simple. During exhalation, the vagus nerve increases its activity and slows the heart. Lengthening the exhale lengthens this slowdown. Over the course of a few minutes, the average heart rate drops and the autonomic balance shifts toward parasympathetic dominance.
We expose this mechanism directly so you can tune the ratio to the situation. Quick calm: 4 in, 6 out for two minutes. Deep wind-down: 4 in, 12 out for five minutes. Subtle daily regulation: 4 in, 8 out — the most replicable ratio in the HRV biofeedback literature.
When to use it
When you already know which direction you need to move. Extended exhale is the customizable technique — pick the ratio that matches the depth of shift you want.
Less ceremony than 4-7-8 (no retention to learn). More adaptive than resonance breathing (you control the ratio). The technique to graduate to once the others feel mechanical.
Or try a different technique