Guide — Biomechanics
Fixing Early Extension
Stop humping the goat. Start rotating.
Early extension is one of the most common and destructive flaws in amateur golf. It occurs when the pelvis moves toward the golf ball during the downswing, forcing the torso to stand up to create room for the club to swing through.
The Root Cause: It's Not Your Hips
Most players attempt to fix early extension by trying to "keep their butt back." This rarely works because early extension is usually a compensation for an open clubface or a poor kinematic sequence.
If the clubface is wide open coming down, or if the path is drastically out-to-in (over the top), your brain knows that rotating properly will result in a dead pull or a shank. To salvage the shot, your body stops rotating, your pelvis thrusts forward (early extends), and your hands flip the clubface square at the last millisecond.
Ground Reaction Forces and Posture
Elite ball strikers maintain their posture by applying proper vertical and rotational forces. As they approach impact, they use the ground to push their lead hip up and back. This clears the hips and maintains the inclination of the spine.
| Metric (Impact) | Amateur (Early Extender) | Tour Pro |
|---|---|---|
| Pelvis Position (vs Address) | 2-4 inches forward (toward ball) | 1 inch back (away from ball) |
| Spine Angle | Significantly more vertical | Maintained or slightly increased flexion |
| Lead Leg | Bent or collapsing | Posting up (straightening) |
How to Fix It
- Check the Face: First, ensure your clubface is square early in the downswing. If it's open, you must early extend to hit the ball.
- Learn to Post: Feel the weight move into your lead heel in transition, and push the ground away with your lead leg to clear the left hip.
- Measure It: Use 3D motion capture to track your pelvic thrust. Book a session to see exactly when and why your sequence breaks down.
Frequently Asked Questions
Does early extension cause a slice or a hook?
It can cause both. Because it relies heavily on hand timing (flipping), an early release can result in a block if the hands are late, or a snap hook if the hands fire too quickly.
Will stretching my hamstrings fix it?
While mobility helps, early extension is primarily a motor pattern and face-control issue, not a lack of flexibility.