Golf Swing Metrics Guide: the Numbers That Actually Matter
9 min read · by the AnchorStance team
You can measure almost anything about a golf swing. The craft is measuring what predicts good golf — and reading each number against an honest ideal range instead of chasing perfection. This guide walks the metric families AnchorStance measures from one phone video, category by category, in the order a swing happens.
Setup: the geometry you start from
Setup metrics are the cheapest fixes in golf — nothing is moving yet. Spine tilt (a few degrees away from the target, because the trail hand sits lower on the grip), shoulder tilt to match, stance width around shoulder width scaled by club, ball position forward of centre for longer clubs, and soft flex in both knees. Get these five near their ranges and every in-swing metric gets easier.
Backswing: loading without leaking
The backswing family measures whether you coil or compensate: head sway and head lift (staying centred), hip sway (turn, don’t slide), X-factor (the shoulder–hip separation that stores power), reverse spine (loading away from, not toward, the target) and wrist hinge at the top. The pattern to look for is not one bad number — it is clusters: sway high + X-factor low is one fault wearing two labels.
Transition and sequence: the hand-off
Transition is where good backswings die. Weight transfer asks whether pressure moves to the lead side; the kinematic sequence asks whether hips → torso → arms fire in order; over-the-top measures whether the club re-routes outside the plane on the way down. These three read best together — a broken one usually implicates the others.
Impact: the moment of truth
Impact metrics grade delivery: head rise (staying in posture through the strike), early extension (hips thrusting toward the ball), and shaft return (delivering the club near its original plane). Premium 3D analysis also reads clubhead speed at impact from 60fps face-on video — informational, because "ideal" speed depends on you and the club.
Tempo: the glue
Tempo ratio — backswing time over downswing time — is the one number that touches everything. The ideal band sits around 2.3–3.6 : 1 (tour players cluster near 3:1). Rushed ratios break the kinematic sequence; grooved ratios make every other metric more repeatable.
How to read your numbers honestly
Three rules keep metric-watching useful rather than neurotic:
- Ranges, not bullseyes: anywhere inside the band is good golf. The middle of the range is not "more correct".
- Trends, not single swings: one swing is noise; ten swings are a signal. Judge in-range rates over sessions.
- Trust labels: a single camera cannot measure everything. Honest tools mark which numbers are measured vs estimated for your filming angle — and never grade the estimated ones.
Measure yours
AnchorStance measures every family above from a single phone video, rebuilds your swing in interactive 3D, and turns the numbers into one focused fix with drills — free for your first swing.