Sometimes, the apple doesn't fall far from the tree. As long as it was raining, I started to think about how, sometimes, when I run in the rain, I zone so completely that I am not even aware of the rain that is falling. It just melts away. As I was pondering that thought, I realized how often running analogies come in liquid form. Look at my second paragraph.
Key words are fluidity, melt, mold, all references to liquid forms.
Even the word run itself. Solids do not. Maybe another reason why we run. Life is hard. There are stresses at work, and sometimes, we lose our jobs due to no fault of our own.