Our body itself isn’t exactly solid (save for a few parts), meaning that it can compress and decompress.
This property is what causes the indentations. It’s similar to a seat cushion. Before you sit on it, it’s one shape, normally more full looking, but after you sit on it for a few minutes, once you get up the seat retains the shape of your butt.
Water retention is unrelated and is when fluids (most specifically water) builds up in your body and can be treated by mainly eating less salt.
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