So explain it Brian. Obviously my troll size brain can't comprehend exercise physiology, but my duck sized brain using simple physics tells me that your snorkle provides resistence so that everytime we breathe either in or out we get a bit of work with resistence training. Unless you are always in slow breathe mode.

Duck

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Just in case you weren't sure, it's official -- CMAS sucks.
Oh yeah, and now they're broke.