This is a great unit to play the 'Memory Game'. I start off by introducing a large number of activities the students can use to answer the question, "What are you doing?" Then I have them stand in a big half circle around the classroom. All the students together ask "What are you doing?" Then starting at one end a student saying "I'm (action)-ing." and acts it out. Ask the question again, then the next student says and acts out the first activity and adds another activity. Every time they break the chain we start over with the next kid in line. They love miming the action. It can work at their desks as well as an icebreaker activity. And you can use this game to introduce the physical actions that you can then use in a number of other games that have them act out the actions: Simon Says, Charades, Follow the Leader, etc.