Here’s an interesting read on how to control your breathing while running.
Just before you crest a hill or reach the end of a speed interval, your lungs go into overdrive. Your breath becomes shallow and rapid. You think if only you could pull in more air, you could surge up that hill or maintain your pace. But the more your chest heaves, the more you struggle. You may even end up exhausted, bent over, gasping for air.
Source: Lung Power