I have tried 3 student heart rate apps including the built in heart rate from Apple. They all show old data, but a soon as you click the complication, it updates to real time data. Why is this not updating in the background. Both the app and watch app have background app refresh on.
Apple Watch
See the "Turn on heart rate data" section in:
Check your heart rate on Apple Watch - Apple Support
You might also want to see the "When Apple Watch measures your heart rate" section in:
Your heart rate. What it means, and where on Apple Watch you’ll find it. - Apple Support
See the "Turn on heart rate data" section in:
Check your heart rate on Apple Watch - Apple Support
You might also want to see the "When Apple Watch measures your heart rate" section in:
Your heart rate. What it means, and where on Apple Watch you’ll find it. - Apple Support
Heart rate complications do not open on watch face
