Begin the drill by discussing with the students that by focusing our attention and concentration, we are able to make better decisions.
We are more knowledgeable because we can learn more through our ability to better focus. If we know more about a subject we can make better decisions based on that subject.
In the martial arts, the more different kicks we know, the better we can determine which kick is best for a particular target.
Simply use drill lines with parents or instructors holding the square targets at the end. As the students move through the line, they will have to determine which kick is best to strike the target with.
Have the instructors change the angle of the paddle to require a different kick every time the students come through the line. The student must decide which kick is most appropriate and focus on their target.