I have moved into a new area and I am starting to recce new running routes so I downloaded Strava to have a little play. To be honest I can't figure out how to work it - I have a Apple Watch S0 so I need to carry my phone as well. Do I have to start the app on my phone or my watch or both? If I start it on my phone then it does seem to start logging on the watch but although the heart rate is displayed on the watch I have no heart rate data stored in Strava at the end of the run. This is all a bit rubbish isn't it? I might as well not use the watch at all and just use the phone. After all it is too fiddly to stop the run on the watch with sweaty hands.