Free breathing tool
Physiological sigh: how to do the double inhale, long exhale
The physiological sigh is two breaths in through the nose, the second a short top-up, followed by one long, slow breath out through the mouth. Do it 2 to 5 times when you feel tense, and use the guided orb on this page to get the timing right.
By Amanda Perry, founder of Reset Buddy and author of From Burnout to Breakthrough
Updated 29 October 2026
Try it now
Two in through the nose, one long out
Get ready
3
Press start. You get a 3-second count first.
One round is about 9 seconds. Breathe gently, and stop if you feel dizzy.
How to do the physiological sigh
Breathe in through your nose
A normal, comfortable breath, for about two seconds. No need to fill right up.
Top it up with a second, shorter breath in
Sip in a little more air through your nose, as if your lungs have a bit of room left at the top. About one second.
Breathe out slowly through your mouth
Long and unhurried, about twice as long as the two breaths in together, around six seconds. Soft lips, as if you're blowing gently through a straw.
Repeat 2 to 5 times
Then let your breathing go back to normal and notice how your body feels.
Keep it gentle. You're aiming for a breath out that's longer than the breath in, so there's no need for big, deep breaths. If the top-up feels awkward at first, that's normal. After a few rounds most people find the rhythm.
You can do it anywhere, eyes open, and it's quiet enough for a desk or a queue. If a long mouth breath feels too obvious, breathe out slowly through your nose instead.
Double inhale, long exhale: the same thing by other names
You'll see this breath called the physiological sigh, the double inhale exhale, the double inhale or a cyclic sigh. They all describe the same shape: in, a little more in, then a long breath out.
The small difference is how long you do it for. A physiological sigh usually means one to a few of these breaths, when you need them. Cyclic sighing means repeating them for a few minutes, which is how it was done in the study below. The orb above lets you do either: pick 2 or 3 rounds for a quick settle, or use the 5-minute nervous system reset for a longer one.
Why the physiological sigh may help
Your body already sighs on its own from time to time. The deliberate version slows that down and repeats it, with the emphasis on a long, easy breath out.
In a month-long Stanford study of 108 people, five minutes a day of cyclic sighing lifted positive mood more than mindfulness meditation did. Anxiety fell by a similar amount in all the groups, so the clearest finding was about mood (Balban et al., 2023, Cell Reports Medicine).
More broadly, slow breathing with a longer out-breath has strong research behind it. A meta-analysis of randomised trials found breathwork lowered self-reported stress, a small to medium effect (Fincham et al., 2023).
The honest limits: the sighing study was one trial, over a month, using five minutes a day. A few sighs in a hard moment may help you feel steadier, but it isn't a treatment for anything. See the full evidence on our science page.
When to use it
- Right after a jolt: a sharp email, a near miss, a difficult call.
- Before something you're dreading, like a meeting or a hard conversation.
- When your chest feels tight and your breathing is quick and high.
- Between meetings, when you're overwhelmed at work.
- When everything feels too much at once and you need a first step.
If you prefer an even count to follow, try the box breathing timer. If you're not sure what you're feeling, the feelings wheel can help you find the word first.
Safety: when to stop
Breathe gently, never forcefully. If you feel dizzy, light-headed or tingly, stop and let your breathing return to normal. That usually means you're breathing too hard or too fast, so go softer next time.
If you have a heart or lung condition, or you're pregnant, check with your doctor before trying new breathing exercises. If breathing exercises make you feel worse, stop. You don't have to push through.
Keep going
More free tools and guides
- Box breathing timerIn 4, hold 4, out 4, hold 4. A free guided timer with a square to follow.
- Interactive feelings wheelTap how you feel, find the exact word, then try a reset matched to it.
- 5-minute nervous system resetBreathe, shake it out, ground yourself, take one small step. Guided and free.
- When everything feels too muchA free 90-second reset, then six steps for calming down when you're overwhelmed.
- Overwhelmed at workA discreet 90-second reset for your desk, between meetings and before your inbox.
- The science behind the resetsThe published research behind each technique, graded honestly, with its limits.
- Free Right-Now Reset KitSix two-minute resets on one pocket card, sent to your inbox.
Want the sigh matched to how you feel?
Reset Buddy starts with a feelings wheel. Tap how you feel, breathe with a calm orb, then do one simple activity matched to that feeling. About 2 to 5 minutes, with nothing to figure out.
Start your free trial. After that, $4.99 a week, $9.99 a month or $79.99 a year. Cancel any time.