According to Wikipedia it means mathematically the entirety or all of something. Lot of people know it and say it but how many of us actually give 100%. By this I mean day in day out on a consistent basis. If this was the case, we would not be complaining that we need to loose 20 lbs, make more money or have a better relationship. However we live in a day and age where people are actually proud about how lazy they are, and go out of their way to do as little as possible. I admit that there are several things where I know I could do better, given the time and the effort. I even recently heard an advertisement of someone boasting about how they work about 15 minutes of solid work each day.