Ask a room full of anglers what separates the good ones from the rest and you will hear about casting, flies, and reading water. This short lesson points to something simpler that many of us forget: stagnation. We stand in one spot and fire the same cast over and over, hoping the fish will eventually change its mind. The fix is a mindset our instructor calls fishing new water.
What "new water" actually means
It does not mean driving to a new river or hiking to a new spot. It means that from wherever you are standing, nearly every cast should land in a slightly different place. Picture yourself in a creek with a rock thirty feet ahead and a few seams running around it. Instead of casting to the same seam again and again, you work the whole picture: left side, then right, then down the middle, then a little higher, then the gap between the rock and the seam.
The instructor makes one exception, which is sight fishing to a visible fish. Even then, he suggests varying the water slightly so you are not making identical presentations.

Why repeating the same cast backfires
When you make the same cast a hundred times, two things tend to happen. First, if the fish has not eaten, there is a good chance your drift is not right, and repeating the same flawed drift will not fix it. Second, you are steadily increasing the odds of spooking the fish. Each line landing, each shadow and each splash adds pressure. Once a fish is put down, it stops feeding, and your next fifty casts are wasted.
Three benefits of changing your target
The instructor lists three payoffs for working new water with each cast.
First, you open the door to fish you did not know were there. Trout often sit in spots that look unremarkable, and the only way to find them is to put the fly through every lane.
Second, you can improve your drift. A slightly different angle or position may give you a longer, cleaner float that finally persuades the fish you have been watching to move and eat.
Third, you avoid putting fish down. Spreading your casts around keeps the pressure off any single fish and extends how long a run stays productive.

How to practice it
On your next outing, divide the water in front of you into lanes in your head. Make a rule that you will not cast to the same lane twice in a row. Start at the near side and work outward, or start with the far side and bring your casts in closer. After a few lanes, take a step or two and repeat. You will notice you are covering far more water, and you will start paying closer attention to how your fly drifts in each lane.
It is a basic habit, but the instructor calls it a great way to level up from a fly fishing standpoint, because it improves both your coverage and your awareness of the water.
Gear
Covering water efficiently starts with a well-built rig and a leader that turns over cleanly in different lanes. Our Tips and Tricks for Fly Fishing eBook collects practical rigging and technique advice, and your local fly shop can help you tune your setup for the water you fish most.