The P-System, Position by Position: Faults & Fixes
The P-System, popularized by instructor Mike Bennett and biomechanist Andy Plummer in their Stack & Tilt work and now used by every modern coach, divides the golf swing into ten checkpoints. Each one isolates a specific moment of the motion so a coach — or an AI — can compare your swing to a reference frame by frame. This guide goes deeper than the textbook: at every position, you get the ideal look, the most common fault, a simple drill and what SmartCaddie AI measures automatically.
P1 Address
Ideal: spine tilted slightly away from the target, weight 50/50, ball position aligned with the bottom of the swing arc, lead arm and shaft forming a straight line down to the ball.
Common fault: S-posture (over-arched lower back) or C-posture (rounded shoulders). Both kill rotation later.
Drill: "Tall to ball" — stand upright, hinge from the hips until the club soles, keep ribs stacked over pelvis.
SmartCaddie measures: spine angle, hip hinge angle, weight distribution and ball position relative to lead foot.
P2 Shaft Parallel (Takeaway)
Ideal: club shaft parallel to the ground and to the target line, hands roughly over the trail thigh, clubhead just outside the hands, body has rotated as one piece.
Common fault: the dreaded "inside takeaway" — hands roll, clubhead drops behind the body, forcing a re-route on the way down.
Drill: place a headcover behind the ball; brush it back without disturbing it.
SmartCaddie measures: shaft angle vs. target line, clubhead path, lead-arm/chest synchronization.
P3 Lead Arm Parallel
Ideal: lead arm parallel to the ground, club shaft pointing parallel to the target line, wrists fully hinged at 90°, trail elbow folding down (not flying out).
Common fault: chicken wing — trail elbow lifts and the shaft crosses the line.
Drill: "Pump drill" — rehearse P3 to P5 slowly, keeping the trail elbow tucked.
SmartCaddie measures: wrist hinge, trail-elbow angle, shaft plane.
P4 Top of Swing
Ideal: shoulders rotated about 90°, hips ~45°, lead wrist flat, trail wrist bent, shaft parallel to the target line, weight stacked into the trail heel.
Common fault: overswing past parallel with a cupped lead wrist — adds an open face that you must close violently on the way down.
Drill: stop your backswing when you feel resistance in the trail hip, before the arms can keep going.
SmartCaddie measures: shoulder turn, hip turn, X-factor (shoulder–hip differential), lead-wrist angle, shaft cross-line.
P5 Lead Arm Parallel (Down)
Ideal: lead arm parallel to the ground on the way down, shaft slightly steeper than at P3, hips already 30–40° open, pressure shifted into the lead heel.
Common fault: "casting" — early release of the wrists. Power is gone before impact.
Drill: "Pump-and-hold" — pause at P5, feel the lag, then complete the swing.
SmartCaddie measures: lag angle, hip rotation, ground-pressure shift estimated from torso lateral motion.
P6 Shaft Parallel (Delivery)
Ideal: shaft parallel to the ground and to the target line, hands ahead of the clubhead, lead wrist still flat, trail elbow in front of the trail hip.
Common fault: over-the-top — shaft above the trail shoulder line, producing a steep out-to-in path (slice).
Drill: "Headcover under trail arm" — keep it pinned from P4 to P6.
SmartCaddie measures: shaft plane vs. target line, trail-elbow position, hand path.
P7 Impact
Ideal: hands ahead of the ball, lead wrist flat, hips ~40° open, shoulders roughly square, pressure 80%+ on the lead foot, head behind the ball.
Common fault: early extension — pelvis pushes toward the ball, arms get stuck behind the body.
Drill: "Wall drill" — rehearse the swing with your butt touching a wall; stay in contact through impact.
SmartCaddie measures: shaft lean, hip-thrust direction, lead-wrist angle, head position vs. ball.
P8 Shaft Parallel (Post-Impact)
Ideal: shaft parallel to the ground after impact, club exiting low and left (for a right-hander), arms extending fully.
Common fault: "chicken-wing" follow-through — lead arm collapses, signaling a stalled body rotation.
Drill: "Two-tee gate" past impact — swing through both tees without hitting them.
SmartCaddie measures: lead-arm extension, club exit angle, body rotation rate.
P9 Lead Arm Parallel (Release)
Ideal: lead arm parallel to the ground, both arms folded together, shaft vertical or just past, chest facing the target.
Common fault: "flippy" release — wrists unhinge too fast, shaft passes the lead arm too early.
Drill: half-swings with a towel under both armpits — keep it pinned through P9.
SmartCaddie measures: chest rotation, arm fold, shaft-vs-arm timing.
P10 Finish
Ideal: balanced on the lead foot, trail toe lightly down, belt buckle facing the target, shaft draped behind the neck, you can hold the pose for 3 seconds.
Common fault: falling backward — usually a symptom of an early extension at P7 or a reverse pivot at P4.
Drill: hold the finish until the ball lands. Every shot. Every range session.
SmartCaddie measures: balance, hip rotation, weight distribution.
Why work with positions instead of "feel"?
"Feel isn't real" is a coaching cliché for a reason. Without checkpoints, you can practice for months and reinforce the same fault. The P-System gives you a shared vocabulary with your coach, lets video tools and AI compare you to PGA references in milliseconds, and turns a vague "swing harder" into a concrete "rotate 10° more at P4." That is exactly what SmartCaddie's frame-by-frame analyzer does — automatically, on every swing you record.
Audit your 10 positions
Record a swing in SmartCaddie and get an instant P1–P10 breakdown.