Personally, I don't know much about heart rate beyond what it means for you. I stumbled upon this support page entitled, "Your heart rate. What it means, and where on Apple Watch you’ll find it. (Learn how Apple Watch measures your heart rate, and get tips for a more accurate reading.)" and I figured I'd share it to help anyone else who doesn't really know anything. Not that theres everything here but how you wear the watch matters if you want accurate heart rate readings, check it out.. https://support.apple.com/en-us/HT204666 ---------- The site reads, "every 10 minutes". That seems slow..? is it?