Harvey Penick once wrote in the Little Red Book, “If there is such a thing as a Magic Move in the golf swing, it is to start the downswing by shifting your weight onto your front foot bring the trail elbow a little closer to your body.”
Make a practice swing, stopping your hands below your chin on the downswing. The shaft of the golf club should be parallel to the ground and pointed at the target at this point. This indicates a slight in to out swing path and a shallow angle of attack.
This is made easier with the driver by moving the ball position 2 inches (the height of the tee) forward and opening your stance slightly.
After doing the pump drill, focus on your target and let the lower body lead the parade to the promised land!