Lack of good balance causes mis-hits and leads to slumps. A low center of gravity helps establish your balance and a great way to promote that is by the flat-footed hitting drill.
You can do this with a teed-up driver. With the ball teed up normally, make as full a swing as possible with your heels planted squarely on the ground. This means that don’t want to lift your forward heel on the backswing nor your backward heel on the follow-through. As I indicated, make as full a swing as comfortable, but don’t worry about distance. Instead concentrate on the centered feeling of your feet and lower body.
This drill focuses your attention on the lower half of your body and lowers your center of gravity thus increasing your stability – the key to good balance.
Try hitting 15-25 shots and then go back to your regular swing, but keep that “low, heavy” feeling in your feet. You will find that this drill with keep you more centered, stable and balanced.