&gt; Its heart rate monitor is about as accurate as a chest strap.<p>I&#x27;m surprised to hear that. I&#x27;ve found the apple watch to have very significant errors for measuring heart rates, often over 20% versus a chest strap.<p>For my purposes that makes it largely useless. I&#x27;m admittedly serious about tracking my exertion levels: I run about 40+ miles per week, use a Polar Ft7 for comparison.