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For Ron Fisher, exercise is a habit he started as a teenager and honed in the U.S. Army, continuing through his 40s until he’s determined and steadfast in his 80s. He hits the gym six days a week. week for two hours: during the first, you do strength exercises with your upper or lower body, and, during the second, you use a treadmill or endure a spinning class in which there are people decades younger.
