Activity trackers get smarter at measuring fitness

By Dorene Internicola NEW YORK (Reuters) - Fitness activity trackers have come a long way since Leonardo da Vinci sketched a rudimentary gear-and-pendulum pedometer to track the treks of 15th century Roman soldiers. Today’s devices count calories, measure sleep patterns and monitor heart rates as well as steps. Fitness experts predict their popularity and usefulness will grow as they become more sophisticated. ...



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