Continuous heart rate on iWatch 7
Does the heart rate stay visible continuously and update in real time? Is it visible on a bright day? I plan to use it while bike riding.
Apple Watch
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The "basic" heart rate functionality does not record your heart rate continuously. It takes samples every so often (a few minutes usually). If you want to see you heart rate continuously, start a biking workout session (Start a workout on Apple Watch - Apple Support); the display will then display all your workout informations. You may need raise your wrist for the display to be at its full brightness.