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The hypoxia thing I just use a plain old white dust mask
If anyone has ever used one of these for work or anything were you exert yourself you will know how hard it is to breath in them.
I use this while jogging, skipping, bag work, anything that get the heart going
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Take a BJJ blackbelt and punch him in the face he turns into a brown belt.Punch him again and he becomes a purple belt and again he becomes a blue belt and again he becomes a white belt-Carlson Gracie
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