you teach Jeremy ,You are also his friend since you have been teaching him for a long time. Now he is doing push-ups and counting in his head how many he did, but of course he adds to the number by which he did push-ups.. while you're distracted. after a few minutes he gets up, all tired and out of breath,comes up to you -hey! I did 50 push-ups! that's enough, don't ya think?