Tennis is a sport that connects with the golf swing. Like in golf, you use the lever system to hit the ball at the apex or top of the tennis serve. The tennis forehand uses the up to under motion on the backswing and into the ball. You also step back with your left leg as the racket accelerates forward to create more speed.
Baseball is another sport that is almost identical to golf. If you watch baseball players hit the ball, they set up, load their right side, and step. This motion puts force into the ground while their front foot pushes back as they accelerate the bat forward. That same motion is how Mike Malaska hits a golf ball.
Mike demonstrates how backswing action in tennis and baseball is the same as hitting the driver. If you have played tennis and baseball, utilize that feeling to accelerate the driver. The only difference tennis and baseball have to golf is that when you hit the ball, it is out in front of you. In golf, the ball position is back and square to you. That means you must get turned more on the backswing to hit the ball, but the same action applies to all three sports.
Take those actions and apply them to your golf swing. The body movement patterns are the same. It is important to start connecting to other sports that you have played.