The "secret" is very simple though it require some deeper knowledge in anatomy and physics. When a golfer wants to power the motion and literally jumps off his shoes it is a result of subconscious atavistic action of releasing the primary ground forces, i.e. vertically oriented ones. He uses only "the tibial power" transmitted to his lead foot via the big toe (plus the other two closest to it) and medial arch spring. The action relocates the mass dynamically directly from the big toe to the outside of the foot. We can see jumping action and lead knee early extension as a result (of course also the opposite problem exists -- i.e. keeping the lead knee flexed too long resulting in a pivot stall but this is quite another story).
The cure would concentrate instead on engaging the lateral part of the foot and two last toes and keeping both arches in not elevated position starting from the medial to lateral one. We can observe a sort of a common denominator of the greatest ballstrikers who use all toes and splashing both arches into the ground in the downswing phase. Moreover, I have recently observed simultaneously with formulating the thesis that the lead foot of some of the best ballstrikers in the history of golf appears to relocate its position (moving a bit to the North, or more precisely said, a little bit North-West-- because of the flare angle -- assuming we are facing North while standing over the ball) while attempting to subconsciously release both arches sequentially and activate the two last ones to release the lateral arch. It is of utmost importance.
How to automate this action ? It was not easy to find a reliable answer. After a big dose of watching the motions of these of the great ballstrikers who had this lead foot forward move I suddenly noticed that some of them seemed to extend their big toe somewhen in the backswing phase. I experimented quite a lot and it can be stated beyond any doubt that our subconscious mind never lets the toes be in extension after replanting the lead foot on transition no matter which toe it is. We need simply to get rid of the big toe while letting the rest of toes work properly helping to work both arches of the foot. Recent studies on lower leg muscles show that the abductor hallucis muscle -- which is responsible for big toe abduction -- plays crucial role in elevating the medial arch of the foot. It means that when we try to separate the big toe from the rest of toes as much as possible we elevate the medial arch at the same time. Moreover, big toe abduction goes hand in hand with its flexion and viceversa -- while we extend the big toe (moving it up) it is much easier to adduct it, i.e. to move to the middle of the foot and put it on the other toes.
Moreover, the whole action of the lead foot big toe aimed at limiting the elevation of the medial arch is luckily very compatibile with pronation of the lead foot that accompanies its correct motion during the backswing ending with rolling the foot on the inner edge and letting the outside of the lead heel contact with the ground if necessary. The replanting brings inevitably all the toes (to an extent except the big toe that also tends to flex and press on the second toe even while being elevated) into flexion when all of them press the ground that is what we desire actually. We succeed in limiting the role of the big toe and "tibial jumping" power and, simultaneously, achieved a pefect base necessary for such a dynamic action of such a relatively small base the foot is.
After releasing the kinetic chain, of course the lead foot can move freely as a result of releasing forces and performing different actions just from ordinary light version of foot supination up to losing entire contact with the ground (common with hard swinging golfers) depending on various factors.
Last but not least, it is really worth to experiment with toes; famous golf pros did this and although they sometimes drew a bit different conclusions leading to different actions from a pure anatomical point of view (e.g. Snead's all toes of both feet in extension, Hogan's and O'Grady's lead foot toes put into extension once, Miller's extending the lead foot toes in fast cycles just before trigger, Elkington's curling lead foot big toe at setup -- just to name a few) they surely did not regret paying attention to this subject.
Watch this vid and observe carefully lead foot actions performed by true greats of yesteryear -- enjoy actions that one cannot barely see any more on the Tour nowadays:
