Runner Things #1991
Posted on 13 Dec, 2013
Imma show you how great I am.
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A Lifetime of Running Wisdom from the Legendary Dr. George Sheehanby George Sheehan
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26.2 Miles to Boston
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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.
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