Rule 15 of 25 · Chapter III — The Motion That Delivers It
Start the downswing from the ground and hips, and let the arms and club follow rather than lead.
Why this rule exists
Pressure shifting into the lead foot before the hands drop is what moves your low point in front of the ball, which is the whole mechanism of hitting ball then turf. If the arms fire first, the club reaches the bottom of its arc behind the ball and you hit the ground before you hit anything else. The lower body starting first also buys time for the shaft to lean forward instead of standing up.
In practice
From the top, feel your lead foot press into the ground and your hips begin to turn open while your hands still feel like they're falling, not throwing. A useful check: the toe of the club should still be pointing skyward when your belt buckle has already started toward the target. If you can't feel it, make half-speed swings and pause at the top until pressure has moved to the lead side, then swing.
When it doesn't apply
Don't turn this into a lateral slide — pushing the hips toward the target without turning them stalls the body and produces blocks and hooks. Off a severe downhill lie, or when a stance is cramped, you may need a quieter lower body and a more arms-led delivery just to make contact.