Buteyko Bubbling:

Bubbling is a breathing exercise, which helps to relax, reduce air consumption and improve respiration. Even a baby can do it! Nevertheless, for some adults, especially with breathing difficulties, it can be difficult. Sasha Yakovleva, Advanced Breathing Normalization Specialist, demonstrates how to do it. If you do his exercises gently and regularly, it will increase the level of carbon dioxide in your lungs as well as the overall oxygenation of your body. This is how the Buteyko Method works.

Relax, have fun and improve your breathing!