The skeleton forms a frame which supports the majority load of your body weight (very much like the metal frame of a building) to distribute it throughout your body. Muscles support your Skeleton to help keep the frame in place and again help distribute the load.
Skin cells on feet do get crushed, but only in a sense. This is why you develop rougher and harder skin on the bottom of them, because the body forms extra keratin in these cells to make them more resistant to damage.
Edit .. Ooops I forgot muscles!
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