From Christine Luff,
Your Guide to Running & Jogging.
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I've heard that I should breathe in through my nose and out through my mouth when I run. Is that correct?

A. No, that's wrong. You should breathe in and out through your mouth when you're running. Your muscles need oxygen to keep moving and your nose simply can't deliver enough. Deep belly breathing allows you to take in more air, which can also help prevent side stitches.

As a beginner, try to run at a pace at which you can breathe easily. Use the "talk test" to figure out if your pace is appropriate. You should be able to speak in full sentences, without gasping for air. Slow down or walk if you're running out of breath.