Few ideas in golf instruction are as well known as the X-Factor. You’ve probably heard it used to explain why tour players hit it so far: big shoulder turn, smaller hip turn, lots of stored energy. But it’s also an idea that’s easy to misapply, especially if you try to force a tour-sized turn into a club golfer’s body.
Where the X-Factor comes from
The X-Factor was developed and named by coach Jim McLean. In a 2010 Golf Digest article, McLean explains that his book used “model numbers” of around 100 degrees of shoulder turn combined with 60 degrees of hip turn, a 40-degree gap. He notes that the book gives a hip turn range of 40 to 65 degrees, and that since 1992 they had learned some tour pros have a gap of even less than 40 degrees.
The same article includes an interesting contrast. Jim Flick, who coached Jack Nicklaus, said Nicklaus didn’t believe in consciously restricting his hip turn, and let his hips react to the swinging of his arms. McLean replied that Nicklaus did restrict his hips by keeping flex in his trail knee, which he says acts as a “governor” against over-turning.
All credit for the X-Factor concept goes to Jim McLean.
What it means for club golfers
The key word in McLean’s description is “model”. These are reference numbers from elite players, not targets every golfer should hit.
Don’t force the gap
If you try to restrict your hips to create a bigger gap, and your body can’t separate the upper and lower body easily, you’ll usually compensate. That might mean a sway, a loss of posture or a lot of strain on your lower back.
Separation is a physical skill
Titleist Performance Institute (TPI) uses the Pelvic Rotation Test to check whether a player can rotate the lower body independently of the upper body. TPI describes this as important for sequencing the downswing and creating separation. If you can’t do it standing still, you’re unlikely to do it at full speed.
The knee flex clue
McLean’s point about trail-knee flex is a practical one. Keeping some flex in the trail knee limits hip turn naturally. Straightening it lets the hips turn more. Neither is “right”; it depends on your flexibility and what you’re trying to achieve.
How to explore your own turn
Here’s a gentle, low-risk way to understand your turn:
Step 1: Test your separation
Try TPI’s pelvic rotation test. Take your 5-iron posture, cross your arms with your hands on your shoulders, and try to rotate your hips without moving your shoulders. Then reverse it. TPI’s article explains what to look for.
Step 2: Make a comfortable full turn
Without a club, cross your arms and turn your shoulders back as far as feels comfortable while keeping some flex in your trail knee. Notice how much your hips want to go with them.
Step 3: Compare on camera
Record a few swings. Look at whether your shoulders turn more than your hips at the top, and whether your hips slide instead of turning.
Step 4: Add a little, don’t force a lot
If you have good separation, you might experiment with a touch more shoulder turn. If you don’t, focus on mobility first.
How DE-SHANK helps
DE-SHANK shows rough shoulder and hip turn estimates on each swing. We show them as guides and don’t score them, because a single camera can’t measure rotation precisely. That’s a deliberate choice: we’d rather be honest than give you a number that looks precise but isn’t.
What we do score, from 30 to 100, are tempo, head movement, hip sway and posture change. Those scores are useful here, because forcing a bigger turn often shows up as more sway or a bigger posture change. If your turn estimate goes up but your hip sway score drops, the extra turn might be costing you. See all our features.
DE-SHANK gives estimates from one camera view. It’s designed for practice feedback, to help you spot habits and track trends.
Common mistakes
- Copying tour numbers. McLean called them model numbers for a reason.
- Locking the hips completely. This is a recipe for strain.
- Turning more by swaying. A bigger turn should come from rotation, not a slide.
Our take
The X-Factor is a brilliant way to understand how good players store energy. Use it as a guide, not a target, and let your own body decide how much turn and separation is right for you. More drills are in our Coaching Tips.
Try DE-SHANK free
See your turn estimates alongside your sway and posture scores. Try the free DE-SHANK beta. It’s free during the beta.
