"Two things will increase your fly-casting casting distance. The first is a tight loop. A wide loop disperses energy around the curve of the line and robs the cast of distance. The second thing that will increase distance is to speed up the line. The haul is what accelerates the rod tip; acceleration of the tip is what makes the line go faster; and the faster the line, the longer the cast. You should use the double haul like a gear shift. When you need help - whether it's dealing with wind or casting for distance - increase the speed of the haul. You don't get distance from your rod hand, you get it from your line hand by accelerating the haul to increase line speed."
- Lefty Kreh, Cockeysville, Maryland