the latter of which involves generating club head speed that s controlled, well-timed, and highly effective.   Here s is legendary instructor Hank Haney explaining this concept further . There s also a reason why pro golfers often look like they swing so slow, but yet their swing speed is 10-20 mph faster than the swings of amateurs.  Essentially they understand, perhaps better than anyone, how to generate the most club head speed at exactly the right time. That time being at the very bottom of the swing, timed perfectly with impact.