4 ms·

The point is to add resistance to strengthen your breathing muscles, not just to slow down your breathing rate.

• Tomte 5y ago
  Would an FFP2 mask work?
  • DennisP 5y ago
    I often used one before I was vaccinated, and it was pretty easy to breathe through it.
  • hollander 5y ago
    Probably but maybe not as powerful as a specially designed device. It's not as controlled, and you can get sloppy more easily.