From the A Journey in TEFL blog:
Energisers are great activities and can save lives when you feel your students are not in the lesson anymore.
These quick games can be used to bring your students back to classroom. A little bit movement, mingle, laughter will break the ice, will help to get rid of the boredom. Maybe the focus is not directly on the language but still you can adapt these games according your students’ needs and levels.
Read descriptions of 5 energizing games at http://evasimkesyan.edublogs.org/2011/07/13/need-energy/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+AJourneyInTefl+%28A+Journey+in+TEFL%29