Joe Saia, a 51-year-old fitness fanatic, has been working out religiously four to five days a week at the Cresco Fitness Center in northern Iowa for the past five years. His standard routine is running a mile, followed by walking to cool down, then lifting. He usually runs on the indoor track, which circles the workout area. Occasionally, he runs outdoors when the weather is hot to build stamina and endurance—just as he learned in the mi

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