Constantly turning your head to breath while doing the front crawl slows you down and can strain the muscles in your neck. The Powerbreather takes a design cue from our cetacean cousins by letting you breath out the back of your head.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/YWecgsi_eJc/breathe-like-a-dolphin-with-this-double+sided-swimming-snorkel
Jamie Chung Jamie Gunns Jamie Lynn Sigler Janet Jackson
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