3 docs tagged with "grf"

Positive angle of attack and vertical GRF—ascending driver delivery, tee-height calibration, and speed without steep iron patterns.

Clubhead speed starts in the turf—not the arms. Ground reaction forces, verticle post, and the Step-Up Protocol for effortless power.

Step, load, and stomp to map vertical ground reaction forces—the dynamic drill that powers the J-Curve without arm-dominant speed.