“This [nasal breathing] technique forces you to breathe maximally through your nose during the sprint, forcing the airways open. During the recovery, if you can maintain nasal breathing the body is being told that even though I am breathing heavily to remove waste, I can still do this and activate calming nerves in the lower lobes of the lungs. So instead of panting during the recovery — which triggers an extreme emergency in the body — you are training the body how to handle high levels of stress without an overwhelming emergency response. During this technique don’t worry about the heart rate, just focus on the breath.”