Set your phone behind you, down the line, and film one swing. Now watch your backside. At address it sits over your heels, as if resting against a wall behind you. If it pushes toward the ball as the downswing starts — off that imaginary wall — you've found early extension.
You're in crowded company. It's one of the most common patterns in amateur golf, and it hides well, because from face-on everything can look reasonable while down the line the whole geometry is collapsing.
What's actually happening
At address you create two angles: forward tilt from the hips and soft flex in the knees. Early extension is the act of cashing both in early. As you start down, the hips thrust forward toward the ball, the spine rises, and your body straightens through the hitting zone instead of after it.
Two problems follow, in order. First, your hips have moved into the space your arms were supposed to swing through — so the club gets stuck behind you, trapped. From there you'll see both blocks to the right and flip-hooks to the left, sometimes in the same round, as your hands try increasingly creative rescues. Second, your entire posture is now taller than it was at address, which drags the swing's low point up and makes solid contact a timing act.
Why your body does it
Rarely laziness — usually athleticism pointed in an inconvenient direction. Thrusting the hips is how your body produces force in a vertical jump, so under pressure to hit hard, it reaches for that familiar move. For other golfers it's mobility: if the hips can't rotate freely, thrusting toward the ball is the easiest available way to keep the swing going. Either way, the pattern is your body solving a problem — it just picked a solution with expensive side effects.
The measurable version of all this is simple: does the forward tilt you set at address still exist at impact? Down the line is where it shows, and CoachVision measures whether your tilt at the strike matches your tilt at setup from that single camera angle — one number for a pattern that's notoriously hard to feel.
The drill — Wall Drill
The imaginary wall becomes a real one.
Find a wall, or use the back of a sturdy chair. Set up in your golf posture with your trail hip lightly touching it — just grazing, not leaning. Now make slow, smooth practice swings, and keep that light contact all the way into the downswing. No ball needed; crossed arms over your chest work fine at first.
The feedback is instant and impossible to argue with. If your hips thrust toward the ball, the contact disappears and you know the exact moment it happened. Your goal is to feel the hips rotate along the wall — turning, clearing, staying back — rather than pushing off it.
Do 10 slow reps, no ball. Slow is non-negotiable: this pattern lives deep in your motor system, and full-speed reps just rehearse the old move faster. When all ten reps keep contact, take the feeling to the range and check it with the camera again.
One honest note: early extension usually loosens its grip gradually, not overnight. But every session your hips stay on the wall a beat longer, your arms get more room and your strike gets more repeatable — and the golfer in that down-the-line video starts looking like the one you've been trying to swing like all along.