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Objects will not get squashed if they're in equilibrium, which is a balance of the forces pushing them down and forces pushing them up.

We have a lot of air pressure on us: about 7,000 kg (15,000 pounds) of air pushing on us from every direction. But we're not hollow: we're full off blood, bones, and muscle that pushes back against this force. This keeps everything balanced, and stops us from being smushed into a pulp.