From across the gym, a squat and a deadlift look like cousins: bend down, stand up, put heavy thing back. That resemblance is responsible for more deadlift faults than any other single idea — because lifters bring their squat to the deadlift, and the deadlift wants nothing to do with it.
Here's the split that matters.
The squat is a knee bend. The deadlift is a hip hinge.
In a squat, the knees travel far forward, the hips drop low between the heels, and the torso stays comparatively upright. The bend is distributed heavily through the knees — depth comes from the legs folding.
In a deadlift, the hips travel back rather than down, and they sit distinctly higher — between the knees and the shoulders at setup, seen from the side. The knees bend far less than a squat's, the shins end up near vertical by the time your hands pass your knees, and the torso tips deeply forward. Depth comes from the hips hinging, and the hamstrings stretch and load like a drawn bow. That deep forward lean feels alarming to squat-trained instincts and is completely right — it's the signature of the hinge.
Two different distributions of bend, two different engines, two different pictures from the side.
Why the confusion costs you
Bring a squat setup to a deadlift — hips low, knees forward, chest tall — and the lift corrects you immediately: the hips pop up several inches the instant the bar breaks the floor, because a hinge lift refuses to start from a squat position. Now you're pulling from a position you never rehearsed, with the bar detouring around shins that were in its way. The famous "hips shoot up" fault is very often just squat-thinking, cashing out.
It runs the other way, too: lifters who only deadlift often turn their squats into low-bar good-mornings. The patterns are genuinely different skills, and your body needs to know which one it's been asked for before the rep starts.
The cleanest mental sort: squat = "sit down between my heels." Deadlift = "push my hips back and load my hamstrings, then stand." If you feel your hamstrings stretch and tighten before the bar even moves, you're in deadlift country. If you feel your knees leading, you've wandered into squat country with a barbell in your hands.
The drill — Wall-Tap Hinges
To teach your body the difference physically rather than intellectually, use a wall. Stand a foot in front of one, facing away, and push your hips back until they tap it — knees soft, shins vertical — then stand tall. Do 3 sets of 8, stepping an inch further away each set.
The wall makes the distinction unfakeable: try to reach it by squatting and your hips drop straight down, nowhere near the wall. The only way to tap is hips traveling backward — the pure hinge, isolated from its look-alike. A week of these and the two patterns stop blurring; your body files them under separate names.
If you're curious which one your deadlift currently is, a side-on phone clip settles it fast — knee bend, hip height, and how much the torso leans tell the story in the first second. That's exactly the geometry CoachVision's AI coach measures from your clip: whether your pull is a true hinge or a squat in deadlift clothing. Film a light set after your wall taps this week, and find out which move you've actually been training.