If you have a respiratory condition or experience shortness of breath, pursed-lip breathing might be for you. ResearchTrusted Source indicates that this technique can help you regain control of your breathing and improve oxygenation. It can also be used for simple relaxation.According to the Centers for Respiratory Health, the pursed-lip breathing technique can help people with later stages of emphysema release air trapped in the lungs.To do pursed-lip breathing:

  1. Sit or lie down with your knees bent.
  2. With your mouth closed, breath in through your nose for 2 slow counts.
  3. Purse your lips as if giving a kiss or whistling.
  4. Breathe out through your pursed lips gently for 4 counts.

Consider repeating this cycle of breathing 3 to 10 times. You can try this technique up to 5 times a day.

Source: psychcentral.com/stress/learning-deep-breathing