Would be Watch OS App developer here. Is an app like this possible? Is an iOS app able to 'catch' the heart rate continuously from the Apple Watch which is running an Apple Workout App workout?
Thanks for your answers!
iOS App that shows hear rate from running Workout on Apple Watch
Older iOS Health Apps showed this heart rate under 'Vitals'.
No. The data isn't streamed to phone. It syncs from watch to phone approx every 30 minutes and at the end of the workout.