Once the clubhead starts moving toward your head in the backswing the defense mechanism takes over and the body tries to keep that club from getting too close.
Then they realise their head is too far away from the ball and try to bring it back at least to the point they originally started from at address.
Like the two guys playing golf a hundred years ago on a very windy day. One guy kept topping the ball and the other yelled across the the fairway to him. After the round they sat at the bar talking about how windy it was and the one guy says, "By the way, what the heck happended out there? All of a sudden at address you were looking like a vulture!"
The other guy says, "That's becasue you said I have to keep my head down!"
His buddy then says, "Naw, you didn't hear me right. I said you have to get your clubhead down!"
Guess what stuck in our minds after all these years?
