Some squats don't have a bottom — they have a trampoline. The lifter releases at the top, drops, and the moment the hole arrives, boing — back up they come, riding a rebound they didn't so much perform as survive. It looks springy. At light weights it even works. And it quietly caps how good the squat can ever get.
Let's be fair to the bounce first: a small, controlled rebound out of the hole is a real technique — advanced lifters use the stretch reflex deliberately, and there's nothing dishonorable about it. The fault isn't touching the stretch reflex. The fault is the free-fall version: a descent so fast that the bounce is the only thing down there, because no position was ever built to drive from.
What the bounce actually skips
The descent isn't transportation to the bottom — it's construction. On the way down, a controlled squat arranges everything the drive will need: knees tracked out over the toes, trunk braced in one shape, weight spread across the whole foot, depth arriving on schedule. A free-fall skips construction and arrives at the bottom mid-collapse. Then the rebound fires, and whatever shape you happened to fall into is the shape that gets loaded hardest, at the very deepest point, where leverage is least forgiving.
That's the real cost. Not that bouncing is cheating — it's that bouncing loads your least-organized moment with your most-demanding forces, rep after rep, and hands the bill to joints and connective tissue instead of the muscle you were trying to train.
There's a subtler cost too: bounce reps run on rebound physics rather than your timing, so the set stops repeating. Rep three's bounce isn't rep one's bounce, and a set that doesn't repeat isn't practicing anything in particular.
How it shows up on video
You often can't feel a bounce — from inside, it registers as "strong out of the hole." On a side-on or front-on clip it's unmistakable, and CoachVision catches it two ways. Your descent time falls out the bottom of its band — and that band is generous on purpose; a normal one-second descent reads as ideal, so a flagged descent was a genuine drop. And your rep-evenness score frays, because rebound-timed reps drift apart as the set goes on. When the app spots the drop-and-rebound pattern itself, it says so plainly — not as a scolding, but because a controlled descent will make both the squat and the measurement better.
The drill — Paused Bottom Holds
The medicine is spending honest time in the place the bounce skips. Squat to your real depth and stay: five full seconds, heels down, chest proud, knees pushed out, breath steady behind the brace. Five holds of five seconds, light enough that the shape never negotiates.
The pause deletes the rebound entirely — five seconds is far too long for any stretch reflex to survive — so the drive up must come from muscle, from a position, on purpose. That's the whole lesson: the bottom becomes a place you own rather than a surface you bounce off. Lifters are routinely shocked by how much harder a paused rep is, which is just the size of the loan the bounce had been taking out.
Run the holds twice a week for three weeks, then film a normal set. Watch the descent time climb back into the band and the reps settle onto one clock. The spring you lose was never yours. The strength that replaces it is.