for gods sake, how many times have i said naomi on various threads. The sunnah and hadith are broken into categories. There are those you have to do, those you dont have to but its good if you do and also those which you should never do. In the quran it states this about the hadith and sunnah.
Birdie, ok, heres one, sometimes muhammed used to fast for days on end without eating food or breaking it. A few people attempted to copy him but muhammed said no, and that this practice is only for him. Thats why muslims should never fast for more than a day without food.