You decide to do some push-ups. How many? Well, it’s been a while, you tell yourself, let me start with 10. Down you go. When do you start getting mentally and physically tired? Probably around push-up number 7 or 8. Imagine now that you had decided on 20 push-ups instead of 10. When do you start getting tired this time? Go ahead, hit the floor and try it. You probably blasted right past 10 before you even remembered how out of shape you are.
