During the backswing, your goal should be to shift your weight to your rear foot, as opposed to hanging over the front (reverse pivot). The key is to remember that a proper weight shift is the result of a full turn, not a slide. So turn, turn, turn until your weight moves to the back foot and keep your hands away from your body.
This is crucial because on your back swing when turning all of your weight should be on your back foot but on the way down all of your weight needs to be shifted to the front foot to be able to hit the ball further.