When do you start counting?

I have a trick question I like to ask people from time time. If you do thirty sit ups, where do you make the most progress? Which sit up is the most important? The 1st, the middle, the 10th, the last? Which do you think. And the usual answer I get is the 30th. It should be the last one. I then tell them the answer is the 31st. Its not meant to be a real question someone can answer because it is misleading. But the entire purpose of it is to get you thinking this phrase " 1 more". You can always do one more, cant you? When we do our drills and exercises in class I am trying to get everyone to push it until they feel the burn. Then do 1 more. That one more attitude will help you keep making progress because as you get stronger it will take more to make you feel that burn. But once you do you will have this awesome attitude of doing just 1 more.