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

Review Stage Conventions—Cheating Out, Staying Open, Blocking, Pointing with upstage arm and kneeling on downstage knee.
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Concentration Point (Concentration) Introduce the idea of concentration first and then play the game. In a circle, students try to precisely mirror a leader who points to the center of the circle.
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Concentration Claps (Concentration, Teamwork) This exercise helps students practice concentration as a group. Students move across a circle and clap in precise unison with another student with whom they have made eye contact.
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Rant (Concentration) This game requires students to focus on what they are saying, shutting out the distraction of other voices on stage. In a team of five or six, students speak energetically and simultaneously about a debate topic supplied by the teacher. 
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What Are You Doing? (Concentration, Commitment) One actor mimes an action, but–when a second actor asks what they are doing–the first responds by naming a completely unrelated action. The second actor must then mime the unrelated action until the first asks the question “What are you doing?”--at which point, the second actor names a completely unrelated action. The cycle continues until one of the actors hesitates too long or names an action too similar to one already named. The game requires students to maintain a split focus which requires concentration. It also demands that a student listen to a fellow actor and immediately respond to what that actor says.
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Play any game from a previous lesson you think would help reinforce skills learned so far.