Heather Hendershot had no symptoms and felt fine but her Apple Watch indicated that she might have a health problem. Heather Hendershot was relaxing at home and watching television with her husband last Saturday night when her new Apple Watch began to beep. The device had detected that she had a resting heart rate of 120 beats per minute, which is abnormally high for a young adult resting on the couch. The “normal” resting heart rate range for adults is 60 to 100 beats per minute.

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