Any time you play tennis, you probably have a set way to warm-up or practice. Usually, you see most players hitting or tapping the ball standing in the middle of the court. Then as they warm-up, they move back behind the baseline and rally. Of course, this is a great way to warm-up before you play.
 
However, many times a player will not get out of their "comfort zone." Next time you warm up continue to do the short court warm-up, but just for a few minutes. Then put one person at the net and the other player on the baseline. Then reverse the order. Next, both of you stand on the center service land right in the middle of the court. You will be hitting volleys and half volleys back and forth. Do not put the ball away during any of these drills. Keep it in play! Do not move backward and only move in a little. If you move in to hit the ball immediately back up to the service line.
 
After this ask for at least 5-10 overheads. Then feed lobs for your partner to hit overheads. Then hit serves and returns. At least 10 serves and returns. Let each player serve and return serve.
 
Now, you have warmed up by practicing almost every shot in the game. When the match starts you will feel ready for anything. Do not just hit groundstrokes. Get out of your "comfort zone." Start enjoying all your shots, not just ground strokes!
 
Many players can get a tremendous workout by doing this warm-up over an extended period of time (for example, 1 to 1 1/2 hours). Just set aside a certain period of time (for example, 15 minutes) for each drill.
 
Get out of your "comfort zone."
 
Good luck on the courts!