best heart rate monitor for apple watch 4 - apple watch continual heart rate monitoring overview

best heart rate monitor for apple watch 4 - as a runner i've always been curious how accurate the apple watch 4's heart rate monitor is...

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we compare the apple watch heart rate sensor to a chest strap heart rate monitor and we were pretty surprised with the results. apple watch continual heart rate monitoring overview. i test the apple watch series 4 and it's heart rate monitor during a few different types of workouts...

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