America is a country on the move literally. In unprecedented numbers, people of all ages are running, walking, swimming, skiing, and otherwise exercising their way to better health. According to the latest figures, 59 per cent of American adults exercise regularly up 12 percent from just two years ago and more than double the figure of 25 years ago. Even non-exercisers 5 believe they would be more attractive and self-assured if they were more active. Exercise as a routine part of daily life did not catch on until the late 1960s when research by military doctors began to show the health benefits of regular workouts. The focus on fitness also has encouraged Americans to adopt a healthier lifestyle in general. "One of the biggest advantages of the exercise boom is that it's making people much more aware the need to use their bodies and make the most of what they have," says Dr. Paul Taylor, a fitness expert in Washingion, D.C. Is there any end in sight to the fitness fever?No, say experts merchandisers, and specialists alike. Exercise enthusiasts agree that is such an integral part of their lives that it in some form right into old age. As one Oregon jogger noted, when he and his friends 15 and too beat" to run marathons any longer, they'll still be out there walking