Hi ​@Murugan,

what are you using for the heart rate recording? Apple Watch, some kind of chest HRM, or yet something else?

i have apple watch.  i started the run with my app on the phone and not from the watch for clarification. my apple health is connected to Strava

I admit I’m not so sure but does starting an activity on the Strava app on the iPhone actually trigger recording on the AW Strava app? Maybe someone will correct me but I think you need to start it from the AW app if you want the HR recording. 

(I'm actually not using the AW Strava app, I record my activities through the native Apple Workout app on the watch - the one with the "yellow running person” icon - once done, it's automatically saved in Apple Health on my iPhone, and Strava would sync from Health. I prefer this way as I have many more options in terms of which metrics I want to see while running, I can create advanced intervals workouts etc, Strava’s recording seemed a bit too simplified so I only tried once.)

thanks so much, i concur if i use apple fitness app it works perfectly and sync with Strava. i think i will use this instead of starting Strava app on the phone. 

No, if you want to use Strava on the Watch, you have to start it separately.

I track using Strava on both phone and watch. Watch usually gives me cleaner tracks in an urban environment, but now and again, like today, Strava on the watch will just pause on its own and I’ll lose whatever the distance is until I notice.