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watchOS 4 features an updated Heart Rate app, giving even more insight to heart rate, including measurements during resting, workout, recovery, walking and Breathe sessions. Customers can also choose to receive a notification when their heart rate is elevated above a specific threshold while inactive. Other great watchOS 4 features include the proactive Siri watch face that displays the information users need most throughout the day, an enhanced Workout app with new interface, custom High Intensity Interval Training (HIIT) workout type and auto-sets for pool swims.