By GRETCHEN REYNOLDS Phys Ed Gretchen Reynolds on the science of fitness. Nate Meckes recognized that he needed to study the accuracy of activity monitors after wearing one. A shipment of the devices, known technically as accelerometers and designed to measure a person’s movement and energy expenditure, had arrived at Arizona State University, where Dr. Meckes was a researcher. To ensure they were operational, he slipped one over his hip and wore it throughout the day, including to an interminable meeting where he stood up and paced. “I’m not good at sitting still,” he says. Checking his monitor afterward, though, he was flabbergasted. “It had recorded that I was not moving at all,” says Dr....
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