Lead two or three physical and vocal warm-up activities.

Change Three Things (Character, Observation)
Explain to the students: To build a convincing character, an actor should be a keen observer of other people.
Then have the students pair up, and ask them to take 60 seconds and really study their partner – everything about them. Then have the partners turn their backs to each other and change three things about themselves. It could be as simple as untying a shoelace, or switching a bracelet from one arm to the other, or unbuttoning a single button. After a minute, ask the students to face each other again and see if they can guess what three things were changed by their partner. 
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Body Walk with Interviews (Character)
As an actor, physicality is just as important as the lines we speak to portray a character. Let the class as a whole start walking in a circle or in random patterns around the room.  Then tell the students to alter the way they are walking by saying, “Walk with your head leading,” or “Walk with your hips leading.” After a minute, say “Now change to your chin leading,” or “Change to your knees leading.” Continue to change the way the students walk every minute or two by indicating which body part is leading, (e.g. nose, chest, stomach, toes, forehead, etc.) Ask the students, “How does it feel? What kind of character might walk like that? Does it change how old you feel? Does it give a clue to your personality?” 

After the students have established a character based on their walks, ask a volunteer to sit on a chair in front of the class and ask him/her questions—which the volunteer will have to answer as that character. If it seems appropriate, let other students ask questions as well. After five or six questions, let other students sit in the chair to be interviewed.
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Hotel Desk (Character) Explain to the students: When you play a character, you need to know specific information about them. So ask questions like this—How old am I? Where do I come from? What is my occupation? What am I feeling? Do I have any physical characteristics or traits? What just happened before I entered? The “Hotel Desk” exercise will help them practice this character creation process.
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Play any game from a previous lesson you think would help reinforce skills learned so far.