Golf: Vertical Element of Swing

...This vertical force (ground force reaction) is key to squaring the clubface too ....if done correctly there is no need square CF with hands ...the rotating left hip does it automatically as a result of the left leg straightening

Who spends that much time to learn about GOLF of all sports

Much attention is given to rotational force in the golf swing. However, Vertical Force is critical to snapping the shaft into the ball thru impact.

...this vertical movement created by the straightening left leg and the rising left shoulder . These both pull up your left arm which in turn pulls up the heel of grip ...and THAT is what whips the shaft/clubhead into the ball with immense power. There really is no "HIT" with arms ...instead it is a whipping thru action