I hit my driver well and my irons fat. Is that the same fault?

Often it is. A teed ball forgives an arc that bottoms out early, which is why TrackMan has LPGA Tour drivers averaging a positive attack angle. An iron off turf gives the same arc nowhere to go. Driver fine and mid-irons heavy is a pressure pattern worth checking before the swing plane.

Is pressure that moves backwards through impact always wrong?

No. Ball and Best found enough golfers doing it to name it a style, and the 2025 Sports Medicine review concludes that no single technical model describes how a golfer uses the ground. Judge it by the strike: if your low point sits behind the ball and the misses alternate, the trace matters. If contact is clean, it does not.

Can my phone tell me where my pressure is?

No. A camera records position, not force, and the two genuinely disagree: Adam Young's centre of pressure ran fully backwards on a swing where his body barely moved sideways. Video will show a trail heel that never lifts and an upper body leaning away from the target. For the number under each foot you need a plate.

Will moving the ball back in my stance fix it?

It brings the ball to your low point rather than your low point to the ball, and it holds up for a range session. The arc still bottoms out behind where the ball would normally sit, so every club played from a different ball position goes back to missing. Treat it as a setting, not a cure.

What goes wrong, and why

Hanging back: weight stuck on the trail foot

Pressure plates put a number on the weight that never arrives. By the end you will know what good players read at impact, where hanging back puts the bottom of your arc, and what your camera cannot see.

A golfer in a red top swinging on a course, weight and chest turning through under a cloudy sky. Courtney Prather courtmarie, CC0

What a plate reads under each foot at impact

74% / 26%Lead foot against trail foot at impact, one PGA professional on a plate

Stand a golfer on a pressure plate and the split stops being an opinion. PGA professional Todd Kolb, measured on a Swing Catalyst, holds 59 percent under his lead foot at address, 76 percent under the trail foot at the top, and 74 percent under the lead foot at impact against 26 under the trail. Coach Adam Young puts his own figure at 80 to 85 percent under the lead foot, irons and driver alike.

The force gap between a good player and an average one is smaller than the coaching language implies. A 2025 systematic review in Sports Medicine gathered 24 force-plate studies. In one, lead-leg vertical force reached 139.5 percent of body mass in proficient golfers and 136.1 percent in average ones, with standard deviations of 19.6 and 24.2 across that gap.

Timing is what separated the groups. The same review reports low-handicap golfers reaching peak vertical force earlier through the swing than high-handicap golfers, and moving more of it from the trail foot to the lead foot. Hanging back is a scheduling failure rather than a strength one. The force turns up. It turns up after the ball has gone.

Where the arc bottoms out when pressure stays back

-3.7 degreesPGA Tour attack angle with a 6-iron, still descending at the ball

TrackMan defines low point as the distance from the clubhead's geometric centre to the lowest point on the swing arc at maximum compression, and pairs it with attack angle: a positive attack angle means the lowest point happened before impact, a negative one means it happens after. Keep pressure behind the ball and the arc stays centred behind it too. The bottom of that arc arrives early.

A driver forgives it. The ball sits on a tee, hitting up on it is ordinary, and TrackMan's averages have LPGA Tour drivers at plus 2.8 degrees of attack angle. An iron off turf has no such licence. PGA Tour players reach a 6-iron at minus 3.7 degrees, because the grass behind the ball is out of the way only while the arc is still descending. Irons report this fault long before a driver does.

One cause, two misses, in no fixed order

Fat and thin are two variables rather than one, and the guide on those misses takes both apart. Hanging back moves only the first: where along the ground the bottom of the arc sits. It parks that point behind the ball and leaves it there.

Which miss you get depends on the second variable on that swing: how deep the arc runs. Let it reach its natural depth and the sole finds turf before it finds ball. Lift out of it instead, which your arms do without consulting you, and the clubhead is climbing by the time it arrives, so the leading edge catches the ball above centre. Nick Foy lists both outcomes, ground behind the ball and a ball caught thin on the upswing, under this one fault.

The alternation is the diagnosis. An arc bottoming out ahead of the ball fails in one direction only, by taking more turf or less. An arc bottoming out behind it fails in two, because the save is a reflex, and reflexes do not repeat to the millimetre.

Hear it

Three clicks: takeaway, top, impact. Start at the tour beat and move to whichever one you can actually swing to.

Pressure is not weight, and a camera sees one of them

100% backwardsAdam Young's centre of pressure while his body stayed put

Two words get used as one measurement. Centre of pressure is where the ground pushes back. Centre of mass is where your body sits. They can point in opposite directions: Adam Young shows a swing where his centre of pressure moved fully backwards while his body stayed roughly put, and Swing Catalyst has Kevin Streelman in transition with his mass favouring the lead foot while pressure favours the trail one.

A camera is therefore the wrong instrument for half of this argument. Video records position. A plate records force, and no phone produces that number. Pebble Swing reads joint angles from the frames and the backswing-to-downswing tempo ratio from the motion. Pressure under a foot is not in the picture.

Hold the diagnosis loosely for a second reason. Ball and Best sorted golfers into two centre-of-pressure styles, and one study in the Sports Medicine review set 39 front-foot golfers against 19 reverse ones. The review's own line is that no single technical model exists for how a golfer interacts with the ground. A trace drifting backwards is a description. The strike is the verdict.

What the finish is still reporting, seconds late

Stop the clip on the final frame. A trail foot still flat and still loaded, with the spine leaning away from the target, sits on Foy's own list for this fault, and it is the impact pattern again, slowed down and easy to see. The separate guide on reading a finish takes that frame apart in detail.

Posing a balanced finish rehearses the symptom. Compare the last frame with the impact frame in the same clip: a trail heel flat in both means the pressure never travelled. Why it never travelled is beyond the video. A heel that stays down can be a habit, a lead hip that will not rotate far enough to accept the load, or a lead knee unwilling to take it, and the frame looks identical in all three.

Questions

I hit my driver well and my irons fat. Is that the same fault?: Often it is. A teed ball forgives an arc that bottoms out early, which is why TrackMan has LPGA Tour drivers averaging a positive attack angle. An iron off turf gives the same arc nowhere to go. Driver fine and mid-irons heavy is a pressure pattern worth checking before the swing plane.
Is pressure that moves backwards through impact always wrong?: No. Ball and Best found enough golfers doing it to name it a style, and the 2025 Sports Medicine review concludes that no single technical model describes how a golfer uses the ground. Judge it by the strike: if your low point sits behind the ball and the misses alternate, the trace matters. If contact is clean, it does not.
Can my phone tell me where my pressure is?: No. A camera records position, not force, and the two genuinely disagree: Adam Young's centre of pressure ran fully backwards on a swing where his body barely moved sideways. Video will show a trail heel that never lifts and an upper body leaning away from the target. For the number under each foot you need a plate.
Will moving the ball back in my stance fix it?: It brings the ball to your low point rather than your low point to the ball, and it holds up for a range session. The arc still bottoms out behind where the ball would normally sit, so every club played from a different ball position goes back to missing. Treat it as a setting, not a cure.

Sources

Every number on this page comes from one of these.