As seen on the Golf Channel's "School of Golf"
Everything in your golf swing is a result of your setup. Work on your setup every time you play, during your round.
G.A.S.P. (Grip, Aim, Setup, Posture)
GripGet it right.
Aim
Aim the clubface before you set your stance.
Setup
Setup parallel to your target line. Balance is key-not too much on your toes or heels. Stand shoulder width with a 6-iron. "A good setup makes a good golf swing and thus a golf shot, highly probable" –John Jacobs
Posture
Keep your lower back flat. Jump up and down while addressed to the ball. This should provide a feel of a natural posture.