It is a fact of modern life that most people do not exercise enough. This , allied to a diet which is heavy on sugar and fat laden fast foods, has led to a tidal wave of overweight and obese people in most Western countries, a tidal wave that is becoming increasingly difficult to turn back. The problem is that, for most people, it is all too easy and convenient not to take exercise. If you need the basic everyday groceries even if it is only a carton of milk or a loaf of bread it is quicker and more convenient to hop in the car and drive to the store than walk. If you have to get to the third or fourth floor when you go to the office, it is easier (although not always quicker) to take the elevator as opposed to the stairs. Yet many people are willing to pay hundreds or even thousands of dollars every year to be a member of a gymnasium or a fashionable fitness club in order to stay in shape.