Is there a way to expand my lungs to breathe deeper breaths?

I am a soldier Junior High School, and I ran the mile and the mile 4×800m and sometimes two, and let me know if there is any way of breathing during races? Or if there is any way to expand my lungs before a race? I address a 2:10 800m, 5:14 and 11:03 miles on …. Two miles if that helps.

I do not know, but never try to force the lungs more. In the diving from the bottom of the decrease pressure causes air to expand, so if someone can break, exhaling a lung without feeling it. But my point of view, does not feel a burst of lung so be careful. Just run more, get more practice.

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