What the diaphragm does
The diaphragm is a thin, dome-shaped muscle that sits below your lungs and heart and separates your chest from your abdomen. When you breathe in, it tightens, flattens and moves down toward your belly. That makes room in your chest, and air flows in. When you breathe out, it relaxes and curves back up, and the air leaves.
Because the diaphragm moves down, it presses on what's underneath, which is why your belly moves outward as you breathe in. The air never reaches your belly. What you see moving is the muscle's effect.
Cleveland Clinic calls it the most efficient muscle for breathing. Belly breathing is simply letting it do its job while you pay attention.
How to learn it lying down
This is how Cleveland Clinic teaches it to beginners. Lying down helps because your belly is free to move and easier to feel.
- Lie on your back on a flat surface or in bed, with your knees bent and your head supported. Put a pillow under your knees if you like.
- Place one hand on your upper chest and the other just below your rib cage.
- Breathe in slowly through your nose. Your belly rises and pushes the lower hand up. The hand on your chest stays as still as possible.
- Breathe out slowly through pursed lips, as if you were blowing on a candle without putting it out. Tighten your stomach muscles a little so your belly falls. The hand on your chest stays still.
- Repeat for a few minutes, then finish by breathing at your own pace.
Sitting up
Once it comes easily lying down, move it to a chair. Sit comfortably with your knees bent and your shoulders, head and neck relaxed. Your hands go in the same places: one on your chest, one below your ribs.
It's a bit harder this way, because the muscles holding you upright are working too. That's why it's worth learning in bed or on the floor first.
With the guide: Belly breathing
On the site, Belly breathing sets the same movement to a rhythm: in for 4 seconds, out for 6, then a 2-second rest before you breathe in again, for 5 minutes. All through the nose. Keep a hand on your belly the first few times.
If you'd rather breathe out through pursed lips, as in the Cleveland Clinic exercise, try Pursed-lip breathing: in through the nose for 2, out for 4 in a slow, steady stream.
And once your belly moves without any help, the Three-part breath (dirga) adds the ribs and chest: three 2-second inhales that fill you from the bottom up, then one 6-second exhale.
How much to practice and what to expect
Cleveland Clinic suggests starting with 5 to 10 minutes, about three or four times a day, and building up gradually. If that doesn't fit your day, one short daily session is still practice.
It also warns about something that surprises people: you'll probably get tired at first. With practice it becomes automatic. Later on, you can rest a book on your belly to feel the movement more clearly.
As for what it's said to do: Cleveland Clinic says it helps you relax and slows your breathing rate. A 2017 review of slow breathing notes that as the pace drops, each breath gets bigger and the diaphragm tends to travel farther. Those are descriptions of how the body works, not promises about results.
Common mistakes, and when to ask
Stop and breathe normally if you feel dizzy, tingly or short of breath. If you have COPD, asthma or another lung or heart condition, check with your care provider first. Cleveland Clinic itself points out that this kind of breathing can go alongside treatment but shouldn't replace it.
- Pushing your belly out. Your belly moves because the diaphragm moves down, not because you inflate it. If you're straining, ease off.
- Taking in too much air. Huge breaths can make you dizzy. Aim for comfortable, slow ones.
- Lifting your shoulders. If they rise as you breathe in, go back to lying down with a hand on your chest.
- Chasing a perfect breath. A little movement in your chest is normal.
Frequently asked questions
Are diaphragmatic breathing and belly breathing the same thing?
Yes. They're two names for the same way of breathing. One names the muscle doing the work, the diaphragm. The other names what you see moving, your belly.
How many times a day should I do diaphragmatic breathing?
Cleveland Clinic suggests starting with 5 to 10 minutes, three or four times a day. If that's too much, one 5-minute session a day is a good start. Repeating it is what counts most.
Why do I get tired or dizzy when I breathe with my belly?
Getting tired at first is common, because you're using the muscle in a new way. Dizziness usually comes from taking breaths that are too big. Stop, breathe normally, and come back with smaller breaths. If it keeps happening, mention it to a health professional.
Can I do diaphragmatic breathing in bed before sleep?
Yes. Lying down is the easiest way to learn it, and many people use it at the end of the day. Don't expect it to put you to sleep every time. Treat it as a quiet way to close the day.