How is our body able withstand the pressure of miles of air in the atmosphere?
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First off, we were born into it. Honestly, if we didn’t have about 14 pounds per square inch pressing down on us we’d suffer and possibly die. That pressure keeps our blood from boiling and oxygen from leeching out of our lungs. Our bodies exert about that much pressure on the air around us and that keeps things balanced.
Second, air pressure hits us from all directions equally. Yes, the air is pushing you down but the air underneath you is pushing you up. You’re being pushing forwards, back, left, and right all in about equal measure so the net effect is just a gentle squeeze rather than a crushing force.
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