How breathing affects your nervous system
Breathing is linked to the autonomic nervous system. Its sympathetic branch handles mobilisation (“fight or flight”), the parasympathetic branch handles rest and recovery. Your heart speeds up slightly as you inhale and slows as you exhale. So breathing with a longer exhale and a slower overall rhythm helps tip the balance towards calm. In studies, slow breathing has been linked to higher heart rate variability and lower perceived stress.
5 techniques
1. Slow breathing: about 6 breaths a minute
How: inhale for 5 seconds, exhale for 5 seconds, no holds, through the nose. 5–10 minutes.
When: any time you want to lower your overall tension. The gentlest and most versatile technique.
2. 4-7-8 breathing
How: exhale through the mouth; inhale through the nose for 4; hold for 7; exhale through the mouth for 8. Start with 4 cycles.
When: before sleep and when very anxious. The long exhale and hold relax you more deeply. Try 4-7-8 breathing online.
3. Box breathing (4-4-4-4)
How: inhale, hold, exhale, hold — 4 seconds each. 2–5 minutes.
When: when you need to calm down but stay sharp: before a talk, an exam or an important conversation. Box breathing online.
4. The cyclic sigh
How: a deep inhale through the nose, then a short second “top-up” inhale to fully expand the lungs, followed by a long slow exhale through the mouth. Repeat for 1–5 minutes.
When: to release acute tension quickly. In a small randomised study published in 2023, five minutes of this breathing a day improved mood as well as — and on some measures better than — mindfulness meditation.
5. Diaphragmatic breathing
How: one hand on your chest, the other on your belly. Breathe so that mostly the hand on your belly rises as you inhale. 5 minutes.
When: as a foundational skill. Under stress many people breathe shallowly into the chest, and diaphragmatic breathing helps you notice and change that.
Which technique to choose
| Situation | Technique | How long |
|---|---|---|
| Can’t fall asleep | 4-7-8 or slow breathing | 4–8 cycles / 5 minutes |
| Nerves before a talk | Box breathing | 2–3 minutes |
| Sudden stress, irritation | Cyclic sigh | 1–3 minutes |
| Background anxiety during the day | Slow breathing | 5–10 minutes |
| After a long session of short videos | Box breathing + Red Ball | 3 minutes |
Safety
- Dizziness, tingling fingers or air hunger are signals to stop and return to normal breathing.
- Don’t do breath holds in water or while driving.
- Don’t hyperventilate (breathe fast and deep) before breath holds.
- If you have heart or lung conditions, are pregnant, or have epilepsy or panic disorder, check with a doctor, especially before practices with holds.
- Breathing exercises help with stress, but they don’t treat anxiety disorders or depression.
How to make breathing a habit
Tie the practice to something that already happens every day: before sleep, before your first work task, after lunch. In the Cabe app, breathing exercises come with vibration and sound cues, and you can add “2 minutes of breathing” to the habit tracker to see your streak.