Runner Things #1325
Posted on 06 May, 2013
Training to please others means your goals are at the mercy of their opinion. Reach your goals for the opinion that matters yours. - Rolsey
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The surface area of a human lung is equal to a tennis court. To more efficiently oxygenate the blood, the lungs are filled with thousands of branching bronchi and tiny, grape-like alveoli and microscopic capillaries to keep you properly oxygenated.
