all you have to do is swing, not hit a ball
swing from the inside 3-4 times
swing over the top 3-4 times
while looking at a spot on the floor, grass
notice where your head ends up in relation to your target line and notice if one pulls you up quicker then the next.

as far as the body following the head, in doing back flips like a gymnist and full spins, ice skater, yes the body does follow the head. In golf, baseball, tennis, the head has a target that it will fixate on and only leave that target when the body pulls it off of it.