Ground Reaction Force (GRF) is presented as the true engine of the golf swing, driving both speed and stability. Rather than starting with rotation, elite swings rely on how effectively the golfer interacts with the ground to convert linear pressure into angular velocity. GRF is described as the “conversation between the body and the ground,” governing sequence, timing, and control throughout the swing.

Efficient swings follow a strict coaching hierarchy: Sequence → Timing → Magnitude. The correct force sequence is lateral, then rotational, then vertical. Golfers first shift pressure toward the lead side, then create torque, and finally “post up” vertically. Timing is critical: force peaks must occur before impact, while the club is still approaching delivery. Late force application is ineffective, comparable to accelerating after passing a corner. While peak force matters, elite players distinguish themselves through impulse—the ability to apply meaningful force over time without losing structure.

A central concept is the lead-side anchor, which functions as both an accelerator and a braking system. By stabilizing the body through lateral, rotational, and vertical forces just before impact, the lead side creates an “anchor moment” that allows the club to release freely. Without this anchor, the swing becomes chaotic, forcing compensations such as stalling, flipping, or early extension.

GRF also generates torque through coordinated, opposing forces from both feet, often explained using the “bottle cap” model. Relying on only one mechanism—typically a heel-to-toe push—produces raw speed but lacks stability. Balanced contribution from both feet is required to stay centered and control the strike.

Common faults like early extension are framed not as random errors, but as natural consequences of poor force sequencing. Trail-side dominance, late vertical force peaks, or failure to brace against the club’s pull push the pelvis toward the ball and force the body to stand up. Consistent ball striking improves when the lead side “wins” the battle by providing a stable braking-and-posting platform through impact.

Ultimately, consistent power comes from completing major ground-force events early, stacking lateral, rotational, and vertical forces into a small pre-impact window, and training impulse rather than short, violent force spikes. When the lower body prepares the release instead of reacting to it, the swing gains speed, stability, and repeatability.

• 📺 The Explainer

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