Some faults hide in plain sight because every individual shot looks fine. This is one of them. Between shots you stand up tall, legs straight, weight settled back on your heels — and then the ball goes somewhere and you're a half-step late to it. Not slow in a way you can point to. Just always arriving a beat after you'd like.
The culprit isn't your speed. It's your knees, and where they are before the ball is even hit.
Straight legs have nowhere to go
A leg that's already straight can only do one thing to move you: bend first, then push. That's two steps. A leg that's already softly bent is loaded like a spring — it can push now. On a court where the whole game happens in a heartbeat, that pre-load is the difference between reaching a ball comfortably and lunging at it.
Standing tall on your heels also parks your weight in the worst place. Weight on the heels can't go forward without first rocking onto the balls of your feet — another beat lost. Soft knees put your weight over the middle of your feet, ready to fire in any direction. You don't feel faster. You just stop being late.
The reason this fault survives so long is that it's invisible from inside a rally. Each shot you hit looks clean, so nothing flags it. The evidence lives in the between — in how tall your body stands when the ball is on the other paddle.
What CoachVision measures
Filmed from the side, CoachVision reads how bent your knees stay between shots and reports it as ready knees, in degrees. And a heads-up on the number, because it's backwards from what you'd guess: a smaller angle is a deeper bend. A straight leg is around 180 degrees; a soft, athletic, ready-to-spring bend reads lower. So when the read comes back high, near straight, that's the standing-tall-on-the-heels pattern — no spring loaded, first step slow.
This is a side-view read. From behind, the app can't see how much your knees are bent — that front-to-back angle collapses along the camera's line of sight — so if you want your ready knees read, film from the sideline.
The drill — Split-Step Reset Drill
The split-step is how good players load the spring on cue. Here's how to groove it with no partner and no ball: shadow-play a rally, and every time your imaginary opponent strikes the ball, do a tiny hop and land with soft knees, paddle up at your chest. Land — don't stick — light and bent, ready to move.
Three sets of ten. The whole point is to attach "soft knees" to a trigger — the opponent's contact — so it fires automatically in a real rally instead of being something you'd have to remember mid-point.
Do it enough and the bounce stops being a drill and becomes the way you stand at the line. Film a few shots from the side afterward and check your ready knees read — softer legs, quicker first step, and suddenly you're on time for balls that used to get away.