A golf ball does not curve for mysterious reasons. When a shot starts right, keeps moving right and eventually disappears beyond the edge of the fairway, the golfer may feel that several things have gone wrong at once. In reality, modern launch monitors have made it much easier to separate the different parameters involved. Two of them are particularly important: the direction in which the clubhead is travelling at impact — the club path — and the direction in which the clubface is pointing — the face angle. Understanding how they interact is one of the most useful steps a golfer can take towards making sense of ball flight rather than simply trying to “fix the swing”.
Start direction and curvature: two different pieces of information
The first thing to understand is that the direction in which the ball initially launches and the direction in which it subsequently curves are not the same thing. TrackMan defines Launch Direction as the horizontal direction in which the ball starts relative to the target line. A positive value means that the ball starts to the right of the target for a right-handed golfer, while a negative value means that it starts to the left. This initial direction is strongly influenced by the orientation of the clubface at impact. In simple terms, if you want to understand why your ball starts where it does, the clubface is the first place to look.
Curvature requires another piece of information: the relationship between the face and the path. TrackMan calls this Face-to-Path, calculated as the difference between Face Angle and Club Path. For a right-handed golfer, a negative Face-to-Path means that the face is closed relative to the path; a positive value means that it is open relative to the path. Assuming reasonably centred contact, this relationship plays a major role in determining the spin axis and therefore whether the ball curves to the left or to the right.
There is an important distinction here from the way these concepts were sometimes taught in the past. A Face-to-Path of 0° does not necessarily mean that the club is travelling directly towards the target with a perfectly square face. A path of +5° combined with a face angle of +5°, for example, also produces a Face-to-Path of zero. The face and path are aligned with each other, but both are pointing to the right of the target. There is therefore no single “perfect” zero that every golfer should try to reproduce.
Your ball already gives you information
You do not necessarily need a launch monitor to begin understanding what is happening. Watch the ball carefully. Where does it start, and in which direction does it curve? A ball that starts right and then curves even farther right does not provide the same information as one that starts left before curving right. Both may finish in the same rough, but they were produced by different impact conditions.
This simple distinction can completely change the way you practise. Instead of describing every bad shot as “a slice”, “a push” or “something I did with my hands”, you can begin by collecting two pieces of evidence: initial direction and curvature. The objective is not to turn every amateur golfer into a TrackMan engineer. It is to establish a connection between what the golfer feels, what the club is actually doing and what the ball reveals.
What a launch monitor really changes
This is where TrackMan and other launch monitors have transformed coaching. They do not replace the coach, nor do they provide a magic solution. What they do extremely well is measure. Club Path, Face Angle, Face-to-Path, Launch Direction and impact location allow a golfer and coach to test an assumption rather than rely exclusively on visual impressions or sensations.
That distinction matters because feel and reality are often different. A golfer may be convinced that the club is travelling dramatically from the outside when the measured path says otherwise. Another may feel that the face is square when it is several degrees open relative to the path. Numbers are useful not because golfers need to become obsessed with them, but because they can be used to calibrate feel. Once the player knows what a functional movement feels like, there is no reason to think about degrees and decimals on every shot on the golf course.
Launch-monitor data also reminds us that ball flight is more complex than a simple two-variable equation. Impact location matters, particularly with the driver, where gear effect can substantially influence curvature. TrackMan also notes that the movement of the clubhead’s centre of gravity and the movement of the centre of the face are not necessarily identical through impact. Face and path therefore provide an extremely useful framework, but they should not be treated as the entire physics of impact.
Sometimes you have to exaggerate to find neutral
One of the exercises in the original version of this article remains particularly useful, provided it is understood correctly. A golfer whose club path is strongly to the right may not be able to change it simply by being told to “swing straight”. The existing movement already feels normal. Asking that player to experience an intentionally exaggerated movement in the opposite direction can create a new reference point.
If your measured path is, for example, more than 10° to the right, trying to produce the sensation of swinging significantly to the left does not necessarily mean that your next swing will actually travel 10° left. The exaggeration is a training intention, not the desired final measurement. What feels extreme can sometimes produce something surprisingly neutral. This is precisely where measurement becomes useful: hit a few shots, observe the result, measure again and gradually discover which sensation produces the required movement.
The same principle applies to the clubface. Rather than endlessly repeating “square the face”, it can be more productive to experiment with deliberately different face orientations and observe the resulting start direction and curvature. The golfer learns through contrast.
Ball position: experiment rather than universal cure
In the original article, I described watching a golfer whose driver shots consistently started right and curved farther right. One of the first things I noticed was that the ball was positioned surprisingly close to the middle of the stance. Moving it farther forward, towards the lead foot, immediately changed the resulting ball flight.
That observation remains interesting, but it should not be turned into a universal rule. Moving the ball forward changes where impact occurs within the geometry of an individual swing, and the consequences depend on the player’s movement, delivery and clubface behaviour. For this particular golfer, it was a useful experiment. For another player, the same change could produce a completely different result. Ball position is therefore a variable to test, not a prescription to copy blindly.
This is also why looking only at the position of the hands or trying to force the body into an idealised position can be misleading. Golf biomechanics research shows how complex the coordination of the pelvis, torso, arms and wrists is, while systematic reviews have also highlighted considerable methodological differences between studies. There is no scientific justification for reducing every right-curving shot to one supposed body fault.
The coloured-ball drill: give the brain a destination
Another exercise from the original article is worth keeping. I had a tendency to deliver the face slightly left while the club path was travelling to the right. Instead of trying to consciously manipulate the face through impact, I placed a brightly coloured ball roughly one metre beyond the ball I was hitting and slightly to the right of the target line. My intention was simply to send my hands and club towards that external reference after impact.
The value of the exercise was not that the coloured ball represented some geometrically perfect position. It gave the movement an external intention. Instead of thinking about wrists, forearms, shoulders and clubface angles during a movement lasting only a fraction of a second, the task became much simpler: move the club towards something visible.
As with any drill, the result matters more than the theory behind it. Change the reference point, hit several balls and observe what happens to start direction and curvature. If the trajectory improves, you have found a potentially useful sensation. If it deteriorates, the exercise is telling you something too.
Do not chase a perfect swing — learn to diagnose your ball flight
The biggest change in our understanding of golf over the past decade is perhaps not that we have discovered one ideal swing. Quite the opposite. Measurement has shown how many different combinations can produce effective golf shots. A player does not necessarily need a Club Path of 0°, a Face Angle of 0° and a Face-to-Path of 0° to play good golf. A controlled draw or fade requires precisely a relationship between face and path that is not perfectly neutral.
The more useful objective is therefore control. Can you predict reasonably well where the ball will start? Can you understand why it curves? Can you distinguish a face problem from a path problem, or recognise when strike location has influenced the result? And, above all, can you find a sensation that allows you to reproduce a playable trajectory without thinking about five technical parameters over the ball?
That is where numbers become genuinely useful. Not when they turn the golfer into a technician, but when they make the game simpler. Measure to understand, experiment to feel, then play.
