Think about a pillow vs a hardwood floor. A hardwood floor hurts your head because all the pressure is on a small part of your skull. (You just need to see a circle next to a line to see why)
On the other hand, a pillow reacts to the weight of your head and deforms to fit your head shape, so _all_ of your head is in contact with the pillow and no one area is responsible for supporting the total weight of your head.
Feet are no different.
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