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Fitness is much more than the absence of disease -- it's a state of emotional and physical well being, a condition of vigorous health. It comes from good muscle tone, a healthy heart and lungs, and strong, flexible joints. How is good fitness achieved? Athletes know that diet and supplements, alone, can't produce overall fitness. Our bodies are designed to move. In fact, research, such as that conducted by Dr. Ralph Paffenbarger, suggests that you can prolong your life with just half an hour of exercise a day. Since 1962, Paffenbarger has studied over 10,000 Harvard alumni. His research shows that those who lead a sedentary lifestyle have a 44 percent higher risk of death ...