For one thing — sorry, but we have to go here — the data suggests that a high resting heart rate (RHR) is a strong predictor of early death. According to the Copenhagen Heart Study, for example, you’re twice as likely to die from heart problems if your RHR is 80, compared with someone whose RHR is below 50. And three times as likely to die if your RHR is over 90. Studies have found a link between RHR and diabetes, too. “In China, 100,000 individuals were followed for four years,” says Hulya Emir-Farinas, Fitbit’s director of data science. “For every 10 beats per minute increase in resting heart rate, the risk of developing diabetes later in life was 23 percent higher.” So what’s a good RHR? “The lower the better. It really is that simple,” she says. - finance.yahoo.com