Some casting faults are the star of the show. Elbow flare is a stagehand — you barely notice it, but it's the one moving the scenery. When a cast starts weaving, crossing, or tangling for no reason the caster can name, an elbow drifting wide of the body is very often the reason nobody named.
What flare is, and what it feeds
Picture your stroke from the front, camera facing you. The elbow is supposed to work close to your body's line, sliding back and up on the backcast, forward and down on the delivery — like it's traveling along a shelf at chest height. Flare is when the elbow leaves that track sideways: winging out away from your ribs mid-stroke, sometimes just a few inches, often more as the session wears on.
Why it matters is pure geometry. Your casting hand hangs off that elbow. When the elbow swings wide, the hand gets pulled sideways with it — out of the straight, narrow lane it's supposed to travel — and then curves back as the elbow returns. The rod tip inherits the curve, the line inherits it from the tip, and now your cast is weaving through the air instead of tracking straight. A weaving hand is the body-side ingredient of tailing loops and crossed casts: leaders landing in tangles, mysterious knots in the tippet, the fly ticking the rod on the way past.
So flare rarely shows up on the scorecard under its own name. It shows up as "my loops cross sometimes" — with the elbow upstream, quietly feeding the problem.
Catching a fault you can't feel
Flare hides from the caster twice over. You can't see your own elbow mid-cast, and a few inches of drift produces no obvious feeling — the stroke registers as normal. Even side-on video mostly misses it, because the flare happens toward and away from a side camera, not across it.
The facing view is the unlock. Phone on a tripod pointed at you, a few false-cast cycles, and the elbow's wandering is suddenly public. That's the exact angle CoachVision's AI coach uses to read your elbow path and your hand's lane from a clip — the pairing matters, because seeing the flare and the weave together, one feeding the other, turns a vague "my casting gets sloppy" into a specific fixable thing.
One pattern worth knowing: flare loves fatigue. Lanes and elbows that start disciplined tend to loosen late in a session as focus fades, which is why the tangles cluster in the last half hour. If your first clips look clean, film a tired one too.
The drill — Elbow-on-a-Shelf
Give the elbow a track to run on. Imagine a shelf beside you at chest height: the elbow slides back and up along it on the backcast, forward and down along it on the delivery. Two rules — no pinning at the ribs, and no lifting off the shelf, which includes swinging wide of it.
Do 20 slow strokes without the rod, really feeling the elbow glide along the surface, close to your body's line the whole way. Then 10 with the rod, on the lawn, yarn on the leader. Slow is the point: flare sneaks in with speed, so groove the track before you feed it any.
Finish with a facing-view clip to see the track you actually held. When the elbow stays on its shelf, the hand's lane straightens on its own — and the weaving loops, the phantom knots, the "sometimes it just tangles" all quietly leave with it. Small fault, big shadow. Ten minutes a day gets rid of both.