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When taking a step, draw in a lungful of air. Then purse your lips and blow out the air through this small opening as taking your next step. The result is increased pressure in your lungs, which means more oxygen will be transferred to your blood.
Indeed, losing your breath is all about lack of oxygen in your bloodstream. In the thinner air, not as much oxygen is entering your body, so your body’s cells begin to starve. The body’s solution is to seek more oxygen by making you breathe harder.
Read more about day hiking with children in my guidebook Hikes with Tykes.
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