In this how to hit driver tip, I talk about whether or not to use your hips in your swing. Although this seems obvious there are actually teachers out there telling people to not use their hips to hit the ball. Instead, they want you focusing on using the hands and arms.
Sure, the power is generated through the releasing action of the arm unit but this arm unit has to be connected to something. This something is the body coiling and uncoiling. The faster you uncoil, the faster the release assuming your wrists are loose.
Watch how I can definitely increase power when I add hips. Once you understand it, give it a try the next time you are at the range. Once you get the feeling of using your hips and you see more distance you won’t want to ever stop using them.