I was involved in sports when I was younger, so I am full of sports similes like being a high-jumper or a quarterback: all quiet focus, aloneness, and then all-in. You either have it or you don’t. You can get in the zone, or it eludes you. Also, like a game of chess. You win or lose.
I might do my underdrawing, and an underpainting, earlier, but painting happens in one sitting. It’s an all-or-nothing venture.