In the game of tennis, there could be a singles match typically involving just two players, or a doubles tennis which involves four players. The rule modified for the doubles tennis is that a wider court is used since there are more players involved.
Each player can serve the tennis after the fourth game. The server and receiver can stand at any side of the court even though it is ideal that they maintain one side.
Signs of respiratory distress or irregular sounds coming from the respiratory system (coughing, sneezing,wheezing,etc)
Skin color, redness or other clue on the surface of the patient's skin.
Signs of dizziness, lack of awareness, drowsiness, and the general way the patient appears. Do they appear sick, do they appear depressed, anxious, etc.
