"Every Breath You Take." This is for my track and cross country runners who believe they should breathe in through the nose and out through the mouth. The site explains why this method is erroneous for distance runners. Http://www.marathonguide.com/training/coachmindy/everybreath.cfm
More about breathing through the mouth or mouth and nose as opposed to nose only...scroll down to the section on breathing. http://www.drpribut.com/sports/running_form.html