Of course, there is a point, when the intensity of the exercise increases, you can only take in so much air through the nose and you must resort to breathing in through the mouth.The only times I have ever reached the runner's high, is on easy runs when I have been able to breathe through my nose the whole workout.ReplyDeleteRepliesDrew TrachyMarch 15, 2013 at 7:20 AMThanks for your response, Duane.