This exercise helps coordinate right and left brain (something my Drawing students know about) by exercising the information flow between the two hemispheres. It is useful for spelling, writing, listening, reading and comprehension. Stand or sit. Put the right hand across the body to the left knee as you raise it, and then do the same thing for the left hand on the right knee just as if you were marching.Just do this either sitting or standing for about 2 minutes.
Cheerleaders and Drill Teamers- This is a phenomenal way to help you develop your coordination, rhythm, balance, and even core (abs) strength.
To make sure you get between 20 and 30 reps, you could say the alphabet to yourself. I like the standing version, but I know many people do it on their backs.
Here's another version of it. Check this out. This chiropractor is doing it on all fours. He may look ridiculous- but this simple exercise is not just done for physical therapy and rehab- Olympic athletes use this to train.