1) Distribute your weight at address evenly between the balls of your feet and your heels 2) Ensure that your weight during the backswing does not go outside your right foot; meaning, keep the weight on the INSIDE of your right foot 3) Stand far enough away from the ball to enable you to clear your hips
My problem was caused by standing too close. If your hands are straight down from your chin and your weight is properly distributed, you should stop shanking.