First count from one to ten out loud. Then recite the alphabet from A to J out loud. Those two tasks should be quite easy. But now try combining them by rapidly switching between them: recite A1, B2, C3, and so forth out loud. You will likely sense the limitations imposed by the network switching that is required to do this, as well as notice the cost of being slower—perhaps even making an error or two if you push yourself to perform this rapidly.
