Keep Knee Flex Constant - Illustrated Golf Swing Thought (Swing Key)
Concentrate on making sure your knees don’t lock up during your swing, or at least not until after impact with the ball. Specifically, the right knee can have a tendency to lock up at the top of the backswing whereas the left knee can behave similarly at impact.
Keep Your Head Down - Illustrated Golf Swing Thought (Swing Key)
Keep looking down at the ball, even after making contact and up to the moment you no longer can during the follow through. This is contrast to lifting your head just before impact. It constitutes one of the first - if not the first - swing key instructions given to new golfers. Indeed, beginners are often very anxious to see where the ball will go after they hit it, which leads them to lift their heads too soon.
