Generations of hitters were taught to "swing down on the ball" or "chop the tree down," and it produces exactly what you'd expect: topspin grounders, weak contact, and a swing that fights the pitch instead of matching it. If you're rolling over easy ground balls and can't figure out why, a downhill chop is a prime suspect.
Why down is the wrong direction
The pitch is traveling downward when it reaches you — off a mound or out of a machine, it's coming down on an angle. To meet that pitch flush, your hand path should travel level to slightly up, so the barrel is climbing into the ball's plane as they meet. Swing down into a pitch that's already going down and you catch the top of the ball: grounder, roll-over, weak. The chop is a mismatch, plain and simple.
This isn't the modern "launch angle" fad talking. It's geometry. A slight uphill path is the oldest matched swing there is; the down-chop was always the leak.
What the camera reads
Be straight with you first: CoachVision does not put a number on the angle of your hand path. We tried, and on real swings the read scattered by 50 degrees across three competent hitters, so we stopped publishing it rather than grade you against noise.
What the open-side clip does read is finish height — where your hands end up relative to your shoulders — plus extension through the ball and swing length. A chop finishes low and short, and the keyframes usually confirm it: the barrel diving over the top, the back shoulder dropping under. Read the number as corroboration and the frames as the evidence.
Read it as a hand-path shape, not a bat measurement — the camera can't see the barrel, which sits steeper than the hands, and it can't see the ball, so "contact" here is your hands' speed peak, not the instant of the hit. The number tells you the shape of your path; it doesn't grade the grounder.
The fix — High-Tee Line Drives
The same drill that cures a sky-swing cures a chop, because both are about finding the level-to-up window. Set a tee at the top of the zone and hit hard line drives off it without popping up. A chop can't do it — swinging down at a high tee either misses under the ball or beats it into the ground in front of you. To line-drive a high tee, you have to level the barrel out and drive through the ball toward the pitcher. Ten balls, and the feel is "hit the back of the ball on a line, not the top of it."
If you've spent years chopping, the level path will feel like an uppercut at first — it isn't. Film it and check the finish frame: hands finishing high and long, not stabbed down into the dirt.
The honest close
The camera reads your hands and body, not your bat and ball. No phone can honestly measure barrel path, launch angle or where the ball went — and we won't put a number on your hand-path angle either, because ours wasn't good enough to stand behind. But the shape is the coachable thing, and matching the pitch beats fighting it every time. Film one open-side swing, look at your finish height and the contact frame, then ten high-tee line drives a round until level-to-up is your default.