How to Stop the Right Leg from Straightening in a Golf Swing

A straightening right leg in the golf swing is more than just a style quirk, it's a major power leak and the single biggest disruptor of a consistent, repeatable motion. It causes sways, reverse pivots, and a downswing sequence that has to work overtime just to get the club back to the ball. This guide will walk you through exactly why your right leg straightens a​​nd provide clear, actionable drills to stop it for good, helping you build a more powerful and stable golf swing.

Why Your Right Leg Straightens (And Why It’s a Problem)

Most players assume a straightening right leg (for a right-handed golfer) is a problem with, well, their right leg. But it's almost always a symptom of a different issue: improper hip rotation. When you start your backswing, your body knows it needs to create space and generate a turn. If your hips don't rotate correctly - meaning the right hip doesn't move back and away from the ball - your body finds another way to create that turn. The easiest compensation? Straightening the right leg and lifting the right hip up. This feels like a big, powerful turn, but it's actually disconnecting you from your primary source of power: the ground.

This unwanted straightening motion, often called a "lock" or "snap," introduces three major problems into your swing:

• Epic Power Loss: A bent trail leg acts like a spring, coiling and storing energy. When you straighten it, you release all that tension prematurely. Instead of loading into your trail side and using the ground for leverage, you disconnect from it. You can't fire from a stable base because you no longer have one.
• The Destructive Sway: A straight right leg is almost always paired with a lateral sway. Instead of rotating around your spine, your hips and upper body slide away from the target. Think of your body rotating inside a cylinder, a sway pushes you right up against the side of it. From this position, it's incredibly difficult to get back to the ball consistently. You’ll hit fat shots, thin shots, and everything in between.
• A Compromised Downswing: When your hips are out of position at the top of the swing, your downswing starts on the back foot. This often forces an “over the top” move, where the arms and shoulders lunge forward to try and save the shot, leading to slices and pulls. You can’t properly unwind the body when it was never coiled-up in the first place.

The Feeling You're After: Coil, Don't Straighten

To fix this, you need to change your mental image of the backswing. Forget about just "turning." Instead, think about coiling or loading into your right hip. The goal is to feel tension building in your trail side, specifically in your right glute and hamstring. It’s the same feeling as coiling a spring - you are compressing it, not stretching it out.

The correct movement involves your right hip rotating back and behind you, not just sideways or up. As this happens, your right knee should maintain most of its flex from address. It isn't locked in place, but it certainly doesn’t fully straighten. You shouldfeel your weight shifting into the inside arch or heel of your right foot. This is a proper load. It creates the stable, powerful core from which you can launch your downswing, allowing your body to unravel with speed and proper sequence.

Actionable Drills to Stop Your Right Leg Straightening

Understanding the concept is the first step, but instilling the new feeling requires practice. These drills are designed to give you instant feedback and train your body to rotate correctly, keeping that right leg stable and loaded.

1. The Backside-on-the-Wall Drill

This is one of the most effective drills because the feedback is unmistakable. It makes you aware of your hip movement in a way that’s hard to feel on your own.

• Setup: Take your normal address posture, standing about 2-3 inches away from a wall or a golf bag, so your backside is just barely touching it.
• Execution: Begin your backswing slowly. As you rotate, the goal is to keep your glutes in contact with the wall. As your right hip rotates back, your right hip and glute should press more firmly into the wall. Your left glute will move away from the wall naturally. If your right leg straightens, your entire lower body will lift up and away from the wall. You will feel this immediately.
• The Goal: Perform slow, smooth half-swings, focusing on turning your right hip pocket "deeper" into the wall. This trains your hips to rotate around you while maintaining your posture and knee flex.

2. The Trail Foot Drop-Back Drill

This drill exaggerates the correct feeling, making it almost impossible to sway or straighten your trail leg. It forces you to rotate into the right hip capsule.

• Setup: Take your normal address stance. Now, pull your trail foot (your right foot) back about six to eight inches, so it is behind and slightly inside your lead foot. Flare your right foot out about 30-45 degrees.
• Execution: With this altered stance, make slow, controlled half-swings. This setup puts your trail hip in an "internally rotated" position from the start. As you swing back, you will have no choice but to load into the inside of that right leg and glute. If you try to straighten your leg or sway, you will immediately lose your balance.
• The Goal: Hit 10-15 soft shots with this setup, focusing purely on balance and the loading sensation. Then switch back to your normal stance and try to replicate that same feeling of your hip turning back instead of swaying out.

3. The Ball-Under-Foot Drill

This drill is fantastic for feeling how your pressure should shift into the ground without your foot rolling onto its outside edge, which happens when the leg straightens and hip sways.

• Setup: Take your address. Place a golf ball or a small, semi-firm object directly under the arch of your right foot. You should feel a little bump of pressure there.
• Execution: Make your backswing. As you load into your right side, the pressure on the golf ball should remain consistent or even increase slightly as your foot presses down. If your leg straightens and your hip sways, your foot will roll to its outside edge, and you'll lose pressure on the ball completely.
• The Goal: Use this drill to feel a grounded rotation. The pressure should stay on the inside part of your foot - from the ball of your foot toward your heel - as you coil to the top. This proves you are staying centered and using the ground correctly.

4. The Golf Ball Squeeze

This simple feel-based drill helps you maintain internal resistance in your legs, which prevents the right leg from simply giving up and straightening out.

• Setup: Place a golf ball between your knees at address. You don't need to squeeze it forcefully, but apply enough inward pressure to hold it in place.
• Execution: Hit short iron shots at about 50-60% speed. Your focus is on maintaining that inward pressure as you rotate in the backswing. You should feel your thighs engaged. If your right leg straightens, you will lose that inward tension, and the ball will likely fall.
• The Goal: This drill encourages your knees to remain relatively stable as your hips and torso rotate above them. It creates a feeling of a braced yet reactive lower body, stopping the lazy lock-out of the trail leg.

Integrate a few of these drills into every practice session. Start slow, without a ball, just to ingrain the movement patterns. Then, move to short, slow-speed shots, always focusing on the feeling of a coiled, loaded trail side. Over time, that powerless, unstable sway will be replaced by a balanced, powerful, and repeatable rotation.

Final Thoughts

Fixing a straightening right leg is about retraining your hip rotation, not forcing your knee to behave. By focusing on coiling into your right hip and using drills to feel a grounded, stable turn, you can eliminate the sway and build a solid foundation for a more powerful and consistent golf swing. It turns a massive power leak into your main source of athletic energy.

While drills are incredible for building new habits, getting tailored feedback can quickly accelerate your progress. Sometimes, you just need a second opinion to confirm you're on the right track. This is why we created Caddie AI, it’s like having an expert coach in your pocket, ready 24/7. When you're at the range wondering if you're finally keeping your leg flex, you can film your swing for analysis or simply ask the AI questions like "How do I feel pressure shifts in my feet correctly?". We designed it to take the guesswork out of your practice, giving you clear, actionable guidance to help you focus on the one thing that will make the biggest difference.