One of the most debilitating moves in the golf swing that can rob any golfer of power and speed is the Sway.  This happens visually when the hips move laterally away from the target in the backswing.  This move almost always leads to many other swing faults.

There are some great ways to help fix the Sway, some can accidentally have the wrong effect by shifting your awareness to the wrong side of your trail foot.  An angle iron from your local hardware store can be used to give you a great functional drill that can also be used while hitting balls.