Many players have a tendency to swing from their elbow rather than their shoulder, which can cause problems later as they improve. A good hip rotation and swing from the shoulder allows the racquet to stay online behind the ball much longer than with a swing from the elbow. In addition, swinging from the shoulder allows a longer follow through, which will eventually allow you to add more power and spin to your shot. Make sure that when you are pulling the racquet back, you do so with the shoulder as well. If your elbow looks like it is touching your ribs, you will probably swing around your body and cause you to loose valuable control. A big backswing is not necessary but a fluid stroke begins with good racquet preparation, taking the racquet back in one piece with the shoulder and a good hip turn. Swinging from the shoulder will also allow you to follow through up above your opposite shoulder rather than a low swing under your arm.

The same idea holds true on both the forehand and backhand. A quick flick of the elbow or wrist, although adding power, can completely destroy any control you might have. The more moving parts there are in your swing the greater the chance that one can go wrong. Of course I'm not suggesting that you be completely stiff and unnatural. However, I do see that many players lose points because they have too much in their swing rather than too little.

Think of the hinges on a door and make your shoulder the hinge of your swing. You will have more control, the ability to have more power, and you probably won't have as good of a chance of having tennis elbow.