The importance of Demand: It is important to have the right demand. If you are starting something new, it takes time for your body to get used too. For example, if your goal is to do a set of 100 push up non-stop, you will need to start off by doing 25 and add 10 each workout. You cannot just do 100 push up on your first or second try, you have to give your body some time to get used to it. That also doesn't mean that you stick with 25 forever. Eventually, 25 will become easy and you will have to start doing more.