Students Use Stability Balls
An interesting idea – I might try one at my desk!!
http://www.washingtonpost.com/national/teachers-make-move-to-improve-student-focus-by-ditching-desk-chairs-in-favor-of-yoga-balls/2013/02/20/e67aba58-7b31-11e2-9c27-fdd594ea6286_story.html