Amazon.com: Apple Watch SE [GPS + Cellular 40mm] Smart Watch w/ Silver Aluminium Case with Abyss Blue Sport Band. Fitness & Activity Tracker, Heart Rate Monitor, Retina Display, Water Resistant : Electronics
App Nike+ Run Club doesn't show heart rate - Apple Community
Nike Run Club: Running Coach on the App Store
Polar adds Nike+ Run Club support to its fitness devices | Digital Trends
Nike Run Club / AppleWatch / Polar BT HR monitor - experimentation | MacRumors Forums
The next Nike+ FuelBand has Bluetooth 4.0, sports in-built heart rate monitor