To the person who has little 1.______ or experience with physical exercise, this recent 2._________ on physical activity can appear rather strange, even silly. Yet it's not so ridiculous if you stop to think about it. 3. __________ the human body to a car. To function properly, both need fuel, rest, maintenance and 4._________. Take fuel, for example. Just as the automobile needs the proper 5._________ of oil and gas to make it go, so our bodies need the right amount of food and water. If the car receives the wrong kind of fuel, too much oil, or 6. __________, it does not function properly. For the human body, proper nutrition and diet are also essential. Furthermore, 7.__________ the care cannot be driven indefinitely without eventually 8.___________, so too the body requires adequate time to 9._________ . If eitehr the car or the body is abused by 10._________, they need to be maintained and cared for on a regular basis.