With our heat in the summer, everyone seems to be playing a lot doubles, so I thought this would be an appropriate time to discuss the warm-up in doubles. A lot of players have expressed displeasure with their warm-up and asked the proper procedure. The purpose of the warm-up is to allow all 4 players to warm their bodies in preparation for the actual match. The purpose of the warm-up is not to practice, if you need practice, come early and hit before the warm-up.
Start (after spinning the racket and deciding server, side, etc.) with all 4 players on the baseline hitting groundstrokes on their half of the court. Next feed each other a few volleys and overheads. Practice until you can feed these shots to your opponent. All players should then take serves. All serves must be taken before the match begins. There is no practicing of the return of serve. Just serve, catch your opponent's serve and serve it back.
In general, you should always hit the ball to your opponent in the warm-up. Use the match to hit it away from your opponent. You should use the warm-up to calm down and relax before the match starts. If you try these tips you will find other players appreciating your etiquette.
Good luck on the court! Have a great summer and stay hydrated!