To Hit the Reset Button
Every time you hit the water all of your progress is erased.
You might know the fishery well, you might know what lure works most of the time, but there are no guarantees. Every time you fish you start fresh.
Time outside is also a good chance to hit the reset button on your own mindset. Especially me, I get carried away with my daydreams, plotting like a mad scientist, ready to do everything in (and out) of my power to hit the goal.
That wears me out. It's probably not great for the people around me either.
So I fish. I spend some time, by myself, looking for a fish that will bite.
A hard paddle against the current does me some good.