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Your body has a built-in device that does exactly what all these devices described do, along with providing some filtration of air before it gets to your lungs.
by KennyBlanken 3y ago
Your body has a built-in device that does exactly what all these devices described do, along with providing some filtration of air before it gets to your lungs.
It's called "your nose."
https://www.google.com/search?q=athletes+nasal+breathing https://www.google.com/search?q=athletes+nasal+breathing