Hit the Wall
This one’s for me, being a carpenter for most of my life.
Think about a hammer and a nail when loading and unloading your rod. Imagine yourself between two walls, with nails on both. Using a two headed hammer, pretend to smack the nails, first on the back cast, and again when the hand comes forward. Each time you hit the wall the hammer stops cold. This is the stop motion that in fly casting causes the rod to unload briskly.
If you stop cold, the line will shoot forward powerfully, with a tight loop. If you don’t stop hard and slush your rod through the stop, the line loses speed and distance and the loop will open up, making it susceptible to wind. To get full power from your rod, hit the nail on the head.
So, I’ve got a new mantra. “Nail on head, nail on head. . .”