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#739 The Straight Left Arm Myth: 5 Insights From 3D Golf Data
For generations, golfers have been told: "Keep your left arm straight!" But modern 3D biomechanics reveals a different reality. Elite golfers don't lock their lead elbow. They allow natural flexion and re-extension to maintain width, improve sequencing, and deliver speed.
1. The Lead Arm Is Never Fully Locked
PGA Tour reference data shows how the lead elbow changes throughout the swing:
- Address (P1): 167.6°
- Mid-Backswing (P3): 154.8°
- Top (P4): 144.8°
- Transition (P5): 155.9°
- Impact (P7): 161.2°
A perfectly straight elbow measures 180°. These values demonstrate functional extension…
The skinny
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