Crossfit Bomb Scare

roybot December 4, 2011, 3:37pm 9

Those so-called altitude masks suck harder than the people who wear them:

Forums - T Nation – 27 Sep 11

The Slipknot Training Mask = Scam?

Anyone tried this? I was browsing conditioning items and I found this. Does the mask only increase the resistance to breathing or is there someway is reduces the inspired fraction of oxygen?! If it only increase the work of breathing by increasing...

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