durance breathing trainer

Thiis is a custom tab.

1. Take a deep breath and hold it.
2. Press your lips tightly against the mouthpiece.
3. Keep blowing air continuously.
4. Continue until you have blown out all the air.
5. Release the mouthpiece.
6. Check the vital capacity.
7. Clean the mouthpiece.
   
   
   
   
   
   
   
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