“What we are seeking is not a state of static balance, but a state of rotary equilibrium.” – David Lee
The secret to maximizing power and control, lies in your ability to properly offset the forces pulling you toward your toes in the downswing. To accomplish this, at the completion of your backswing, once you have made a full weight transfer back to your left heel, you must “counter-fall” sufficiently at the start of the delivery.
The arms comprise more than 10% of the human body’s weight. If you are solidly balanced on your feet when the down-swing begins, the weight of your arms and club swinging in front of you, will instantly pull you toward your toes (over the top) and out of plane, not unlike a washing machine with all the clothes on one side of it. Most golfers are under the false impression that they want to be balanced during a golf-swing. What we are really searching for, is not a state of static balance, but a dynamic “rotary equilibrium,” where the pull against the body from the weight of the arms and club swinging around us, is negated by the counter-fall, thus giving the appearance of being “balanced” during the swing. Take a look at You-Tube sequences of a hammer thrower. Because of the significant weight of the arms and hammer, the body pivots at close to forty degrees “off vertical” to keep the thrower from being pulled onto his/her face during the rotation. A golf swing is a microcosm of the same move, just in a slightly different plane and with a lighter “club.” All sports where rotation is employed require a counter-fall in order to maintain equilibrium.
In a proper golf swing made by a right-handed player, the weight shifts to the right leg and back to the left leg as the shoulders turn back. As the weight shifts from the right, it lands slightly against the left leg, enough to deflect the body into the counter-fall, on a line or vector that’s approximately seventy degrees left of the target line, ninety degrees being straight behind you. The feeling is like that of tipping a barrel onto its edge before you roll it. The deeper one moves into the counter-fall before the shoulders start forward in the delivery, the less internal effort it takes to turn the core through impact (if the arms are in a state of dead-fall), and the faster it will move. Using mass rotation to sling the arms and club, instead of using shoulder and arm strength, is the proper way to apply power in the golf swing.
Study the “Gravity” golf cross-footed drills and they will teach you to make a perfect counter-fall.