Back to the board

The aim of this exercise is to revise recent vocabulary.
Procedure:
1. Choose a number of words for revision.
2. Place a chair in front of the board facing the class, facing away from the board.
3. Ask one of the students to sit in the chair with their back to the board.
4. Write one word on the whiteboard.
5. The other students explain the word on the board to the student sitting in the chair. The task is to guess the word.