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Dr. Steven N. Blair investigates the health risks associated with physical inactivity and discusses effective, proven methods you can take to encourage people to start—and keep —moving. In "Physical Inactivity: The Biggest Public Health Problem of the 21st Century", we investigate the health risks associated with physical inactivity and discuss effective, proven methods you can take to encourage people to start—and keep —moving. Blair is a fellow of the American College of Epidemiology, ...