A new one for me, but it can be used in situations where you need a change in activity. You need a radio (suggestion was to tune to Radio Disney) or an MP3 player (more control) and speakers. Start the music and have them do different kinds of dances (dance like a chicken, dance like a robot, dance like a bear, dance like a cat, dance like a moose, dance like a worm (etc))... and they freeze when you pause the music.
If they need to work off energy, tell them "fastdance in one spot!" and let them wear themselves out.
A note on music: Use music without any words. Disco music works well, as does anything peppy.
