This is the Cross Crawl technique. You can do it sitting down or standing up- right knee touches left elbow and left knee touches right elbow in an exaggerated march. Do this exercise repeatedly for about a minute.
Cross crawl can improve concentration and help with coordination. It helps the neurological function of the brain by getting right brain and left brain to function more optimally, encouraging cross communication between the two hemispheres. This exercise allows the body's energies to cross over from one side to the other (which they should always be doing). This method is useful for children who have learning difficulties and for anyone who may be experiencing difficulty with concentration. Another great method for treating learning difficulties is a Body Talk method called "Balancing the Brain". You can use this daily for better concentration and for getting right brain and left brain to work together properly. Click here for more info: http://youtu.be/gWCz4jyN2iU