Why does a flattened ball or an inflated bicycle tire quickly return to its original shape if deforming forces cease to act on them?

First, the body itself possesses and makes the Elastic Force (F) act. Also, the most important role in this is played by the fact that, as we remember, molecules are always in chaos and tend to move away from each other to the required distance. (Nuclear forces). That is, the closer we make them come to each other, the more they will resist it. When we squeeze the air with a ball or tire, the distance between the air molecules decreases, as a result of which the body tries to return to its previous shape (the original state of Rest). It turns out, a kind of “air shock absorber”.