Old 07-23-12, 10:43 AM
  #10  
motorthings
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better utilization of oxygen, deeper into the lungs, fewer "stitches" in the side, warms winter air, better filtration, less dry mouth. ymmv, but made a huge difference for me when i was running, and def feel the difference in cycling too.

http://en.wikipedia.org/wiki/Nasal_breathing
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