Have you measured your lead hip internal rotation before changing your swing?

By age 50, internal hip rotation naturally decreases by up to 30%, making a squared lead foot the single most dangerous address position in amateur golf.

When a commercial range instructor tells you to keep your feet perpendicular to the target line while rotating aggressively through the ball, your lead hip runs out of internal mobility before impact. Because the hip cannot clear, that massive rotational torque travels upward into your lumbar spine, grinding the L4-L5 facet joints together under 6 to 8 times your body weight in compressive force.

Truth: The 25° Lead Foot Flare Angle Independent Titleist Performance Institute (TPI) medical professionals screen hip internal rotation before touching a single swing mechanic. If internal rotation is under 40°, the prescription is immediate and simple: flare your lead foot outward 20° to 25°. This pre-sets external hip rotation, clears the pelvis through impact with zero joint restriction, relieves 100% of the destructive rotational shear on your lumbar spine, and immediately frees up 4 to 6 MPH of effortless clubhead speed.

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