How to Fix a Flat Golf Swing Plane
By Paul Harris · Swing Kinematics Lead · Updated
⚡ Quick Answer & Diagnosis
A flat swing plane means the arms and club swing too far around your body in the backswing, leaving the hands low and behind you at the top. It usually comes from a shoulder turn that stays level instead of turning around your spine tilt, arms that don't lift as you turn, or an inside takeaway. Turn the shoulders on your spine angle and add arm lift.
| Biomechanical Root Cause | Corrective Action & Fix |
|---|---|
| The shoulders turn level instead of around the spineAt address you're bent forward, so the shoulders should turn perpendicular to that spine angle: the lead shoulder works down as it turns, not around like a merry-go-round. A level shoulder turn takes the whole swing flatter and leaves the arms to make up the difference on the way down. | Turn the shoulders on your spine angleRotarySwing.com Golf Instruction's Simple Shoulder Plane Drill: rest a club across your chest on your shoulder sockets, with the butt end sticking out past your lead shoulder. Turn back in your golf posture: the club should point down toward the ground slightly outside the ball, not run parallel to the ground. Keep the 'T' formed by your spine and shoulders, feel the lead shoulder point down toward the ground, and use a mirror to confirm the turn is perpendicular to your spine. |
| Standing up during the backswingIf the chest lifts and the spine straightens as you turn, the shoulders can't turn on the tilt you set at address. Once the posture is gone, the shoulder turn flattens with it, however good your intention to turn on plane. | Turn the shoulders on your spine angleRotarySwing.com Golf Instruction's Simple Shoulder Plane Drill: rest a club across your chest on your shoulder sockets, with the butt end sticking out past your lead shoulder. Turn back in your golf posture: the club should point down toward the ground slightly outside the ball, not run parallel to the ground. Keep the 'T' formed by your spine and shoulders, feel the lead shoulder point down toward the ground, and use a mirror to confirm the turn is perpendicular to your spine. |
| The arms swing around without liftingA full backswing is a turn plus an arm lift. Golfers who only turn let the arms ride around with the body, which leaves the hands low at the top and the club wrapped behind them. A flat swing usually lacks that lift. | Hinge the club up, then turnGreg Smith Golf Coach traces most flat backswings to too much forearm rotation in the takeaway: the shaft goes flat, the face points at the sky and both hands finish at about the same height. His Hinge and Twist drill fixes it with the wrists. Hinge the club up first, moving both thumbs toward the forearms so the shaft gets a more vertical angle, then turn to the top so the body turn stays part of the move, and play the shot. Don't just pick the club up with the arms. At the top, look for the trail hand higher than the lead hand and the shaft over your trail shoulder. |
| An inside takeaway that disconnects earlyWhen the club rolls inside or the arms separate from the body in the first part of the backswing, the club starts below its plane and rarely recovers. The takeaway sets the plane the rest of the backswing follows. | Keep the takeaway connected and on planeKerrod Gray Golf's Alignment Stick Backswing Checkpoint Drill uses two sticks: one on the ground along the target line, one attached to the underside of the grip and resting against your lead hip. At halfway back the shaft is parallel to the ground and the grip stick is still pressed to your hip, which stops the club rolling inside or lifting. At the top the grip stick points down along the line of the ground stick. Coming down, the shaft should match the ground stick again at parallel. Peter Finch Golf's version puts a shaft in the end of the grip instead: at parallel the shaft sits over your toe line, and halfway back the butt end points at the target line. If it keeps pointing well right of the target, exaggerate the opposite, straight back and then up until the butt end points at the ground. That is too upright on its own, but practising it usually lands you in the middle. |
| The hands travel below the address shaft planeThe shaft angle you set at address is a useful reference for where the hands should travel as they swing around you. A flat swinger's hands drop below that plane, and without a picture of where it is, the difference is hard to feel. | Give the hands a plane to swing onMatt Fryer Golf's Plane of Glass Drill makes the plane visible. Push two alignment sticks into the ground at your address shaft angle, one in line with the ball and one at the target, each just in front of you. With no club, hold your arms out and move your hands up and down that pane of glass, working them around your body. Then take your setup with a club and feel the hands stay on that plane as they swing around you. |
Your swing plane is the path the arms and club travel on as you swing back and through. A flat plane means that path is too low and too far around the body: the club works inside the hands early, the hands finish low and deep behind you at the top, and the swing feels wrapped around you rather than up and around. Directions here are for right-handed golfers; left-handers should reverse them.
Where laid off describes only the shaft direction at the top, a flat plane is about the whole backswing: how the shoulders turn and where the arms travel. It's usually a contributor rather than the root. It becomes a problem in transition: some golfers throw the club out over the top to escape it, others stay under it and get stuck. If you deliver the club on a good path from a flat backswing, it may simply be your swing.
A down-the-line swing video (or an AI swing analysis) shows which pieces are flat, the shoulders, the arms or the takeaway, alongside what the club does in the downswing, so you work on the part that's actually causing your misses.
Why it happens
The shoulders turn level instead of around the spine
At address you're bent forward, so the shoulders should turn perpendicular to that spine angle: the lead shoulder works down as it turns, not around like a merry-go-round. A level shoulder turn takes the whole swing flatter and leaves the arms to make up the difference on the way down.
Standing up during the backswing
If the chest lifts and the spine straightens as you turn, the shoulders can't turn on the tilt you set at address. Once the posture is gone, the shoulder turn flattens with it, however good your intention to turn on plane.
The arms swing around without lifting
A full backswing is a turn plus an arm lift. Golfers who only turn let the arms ride around with the body, which leaves the hands low at the top and the club wrapped behind them. A flat swing usually lacks that lift.
An inside takeaway that disconnects early
When the club rolls inside or the arms separate from the body in the first part of the backswing, the club starts below its plane and rarely recovers. The takeaway sets the plane the rest of the backswing follows.
The hands travel below the address shaft plane
The shaft angle you set at address is a useful reference for where the hands should travel as they swing around you. A flat swinger's hands drop below that plane, and without a picture of where it is, the difference is hard to feel.
How to fix it, step by step
- 1
Find out whether the flat plane is costing you
Film from down the line at hand height. Note where your hands are at the top relative to your trail shoulder, and whether the club works inside your hands early. Then watch the transition: if the club throws out over the top, or drops further under and leaves you blocking and hooking, the plane is worth working on. If the ball starts on line, a flatter backswing may just be your pattern.
- 2
Turn the shoulders on your spine angle
RotarySwing.com Golf Instruction's Simple Shoulder Plane Drill: rest a club across your chest on your shoulder sockets, with the butt end sticking out past your lead shoulder. Turn back in your golf posture: the club should point down toward the ground slightly outside the ball, not run parallel to the ground. Keep the 'T' formed by your spine and shoulders, feel the lead shoulder point down toward the ground, and use a mirror to confirm the turn is perpendicular to your spine.
- 3
Hinge the club up, then turn
Greg Smith Golf Coach traces most flat backswings to too much forearm rotation in the takeaway: the shaft goes flat, the face points at the sky and both hands finish at about the same height. His Hinge and Twist drill fixes it with the wrists. Hinge the club up first, moving both thumbs toward the forearms so the shaft gets a more vertical angle, then turn to the top so the body turn stays part of the move, and play the shot. Don't just pick the club up with the arms. At the top, look for the trail hand higher than the lead hand and the shaft over your trail shoulder.
- 4
Keep the takeaway connected and on plane
Kerrod Gray Golf's Alignment Stick Backswing Checkpoint Drill uses two sticks: one on the ground along the target line, one attached to the underside of the grip and resting against your lead hip. At halfway back the shaft is parallel to the ground and the grip stick is still pressed to your hip, which stops the club rolling inside or lifting. At the top the grip stick points down along the line of the ground stick. Coming down, the shaft should match the ground stick again at parallel. Peter Finch Golf's version puts a shaft in the end of the grip instead: at parallel the shaft sits over your toe line, and halfway back the butt end points at the target line. If it keeps pointing well right of the target, exaggerate the opposite, straight back and then up until the butt end points at the ground. That is too upright on its own, but practising it usually lands you in the middle.
- 5
Give the hands a plane to swing on
Matt Fryer Golf's Plane of Glass Drill makes the plane visible. Push two alignment sticks into the ground at your address shaft angle, one in line with the ball and one at the target, each just in front of you. With no club, hold your arms out and move your hands up and down that pane of glass, working them around your body. Then take your setup with a club and feel the hands stay on that plane as they swing around you.
- 6
Check the top, then retest
Finish with Chris Ryan Golf's Swing Plane Alignment Stick Checkpoint Drill: with a straight pointer on the grip end, it should point down at a target-line stick when the lead arm is parallel, and back parallel to the target line at the top. If it points well behind you, the plane is still flat. Then re-film and judge the change by the transition and where the ball starts.
The best drills for this fault
Start with the first drill and move down the list if it doesn't fit your swing. Each drill page has step-by-step instructions and the coach's video.
1Fix a Flat Golf Swing Plane
by Peter Finch Golf
2Simple Shoulder Plane Drill (Fix Flat Turn)
by RotarySwing.com Golf Instruction
3Alignment Stick Backswing Checkpoint Drill
by Kerrod Gray Golf
4Fix Flat Backswing: Hinge and Twist
by Greg Smith Golf Coach
5The Plane of Glass Drill (Rounded Swing)
by Matt Fryer Golf
6Swing Plane Alignment Stick Checkpoint Drill
by Chris Ryan Golf
Training aids that help
Optional. Every drill above works with a club and an alignment stick - these just make the feedback harder to ignore.
Eyeline Golf Speed Trap
A base plate with 4 velcro rods. It creates a physical 'gate' that forces you to swing in-to-out. If you come Over-the-Top (Slice), you hit the soft rods.
View on AmazonPower Plane Pro
Guides the club on the proper plane to prevent over-the-top or flat swings.
View on AmazonSwing Plane Trainer
Adjustable guide for maintaining the optimal swing plane.
Search on AmazonAs an Amazon Associate we earn from qualifying purchases.
Frequently asked questions
What does a flat golf swing look like?
From down the line, the club moves inside the hands early, the hands stay low as the body turns, and at the top they sit behind the trail shoulder rather than above it. Many flat swingers feel the club wrap around their back. The shoulders often turn close to level with the ground instead of tilting with the spine.
Is a flat swing plane bad?
Not on its own. Swing plane varies a lot between good players, and a flatter backswing can work if the club comes down on a good path. It's a problem when the downswing has to make a big correction to get back, which shows up as a steep re-route over the top or a club that gets stuck behind you.
Does a flat backswing mean I'm laid off?
Often, but not always. A flat backswing tends to leave a right-hander's shaft pointing left of target at the top, but the wrists and trail arm also decide where the shaft points. Fix the plane first; if the shaft still points left at the top, work on the wrists and trail hand.
Should my driver swing be flatter than my iron swing?
Yes, a little. The driver has the longest shaft and you stand further from the ball, so the address shaft angle is flatter and the swing plane naturally follows it. That's different from a flat fault, where the arms and shoulders swing below the plane your setup created. Judge each club against its own address shaft angle.
Can my posture make my swing flat?
Yes. If you stand too upright at address or lose your forward bend during the backswing, the shoulders turn more level and the plane flattens with them. Check your posture at address, and whether you keep it to the top, before blaming your arms.
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