Again, if you don't know who Sadlowski is...he's the longest driver in the world:
Here's some excerpts from the article:
My belief is that the feet and legs should be dynamic and moving instead of quiet but there is a method to the madness. Long Drive Champion Jamie Sadlowski surely has the right type of movement in his feet. He’s swinging at close to 155 miles per hour and is producing more force (and higher RFD) than someone swinging at 125 mph. Tiger has similar moves though not nearly as forceful since accuracy is very important on the tour.
If there is one killer move, that would be it. If the left heel slides back
during transition, it will prematurely open the hips without any weight transfer or slide. In turn this will force the shoulders to open too early as well. But the main problem with this move would be that it would effectively ruin any chance to fire the body again before impact. The arms would be the only body part capable of moving.