The best way to add yards to your drives is to stretch out the distance between your right hand and left knee (for righties) as you swing back. At address, these body parts are very close together, about a foot apart, but by the time you get to the top, they should be as far apart as possible (right). To do this, feel as if you're reaching with your arms as your lower body holds steady. A good thought is picturing how a slingshot works: You want to stretch back with your right hand, with your left knee as the base. That's how to catapult your tee shots.