Strava apps are not perfect; they have a lot of settings in weird places. To sync with an ANT+ or Bluetooth sensor on Android you have to actually start recordi

Strava apps are not perfect; they have a lot of settings in weird places. To sync with an ANT+ or Bluetooth sensor on Android you have to actually start recording an activity, and then press the small "settings" button in that page. Those settings are different than the ones in the main "settings". And then you add your HR sensor, record heartrate data for your workout and at the end you find that if you want it displayed in the app you have to pay :).