I tested my Fitbit Air against an 'ECG-accurate' heart rate monitor - the results surprised me

I tested my Fitbit Air against an 'ECG-accurate' heart rate monitor - the results surprised me ...
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Heart rate monitors for when you push yourself to the limit and you want the receipts

Tracking your heart rate with a heart rate monitor (HRM) during your runs is one of the most powerful ways to optimize your training, whether you're a dedicated marathoner, power triathlete, or just ...