We don’t cast fly lines, we unroll them in the shape of a loop. As the fly line unrolls it takes our leader and therefore our fly with it. What makes fly casting unique is that when we do a basic cast we unroll the line twice - once on the back cast and once on the forward cast. When done correctly it makes fly casting seem almost effortless.
If you can grasp this concept it really helps you to become a better fly caster. Think of unrolling that fly line off the tip of your rod.
Have a look at the video below. I’m just doing a simple overhead cast but you see the line unrolling and loop shape it creates.
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