one of tigers favourite drills id to tee up 3 balls, get your driver, and try to hit the first one 100 yards, and it will go about 160. try to hit the second ball 150 yards, and it will go about 210. then try to hit an 80% swing on the third ball, and see the ball fly straight and almost your normal distance
well when i get nasty pull hooks that start well left, i know im over excelerating the club.
i usually play like a little cut as well, or a little draw. so when it goes that violently off line i know somwthings up