Another exercise from Gail and Paul dennison's book, Brain Gym is called the thinking X.   Whenever you move the left side of your body, you're using the right side of your brain.  When you use the right side of your body, the left side of your brain is active.  If you think of an X in your mind and see it, move your eyes fromleft to right and right to left.

Thinking of an X tells your brain you want to use both sies of your brain at the same time.  This is a good thing.  It will help you with speed reading and becoming more coordinated in sports and play activities.