This activity provides a useful technique for generating physical and aural ideas around a theme. Explain that the group is going to create a "machine" out of themselves. Name a topic and give the participants a few moments to think of a repeating sound and action linked to that theme. For example, if the theme was "shopping" a participant could mime taking money out of a purse to give to a shopkeeper, whilst saying "I'll have two of those, please."
A movement exercise for the whole group. Move around the room, filling up the space, changing pace, changing direction, being aware of other people but not touching them. Now become aware of your nose. Let your nose lead you around the room. Follow it wherever it goes!
Develop this by focussing on different parts of the body, so that participants begin to discover new ways of moving. Very useful for dance or physical theatre, or simply for discovering movement ideas for characters. Try being led by your stomach, your little toe, your knee, your back and so on.