Rouvy - Strava - iPhone Health app

Sorry, I'm new, not young, and I get lost in the software configuration.

I use Rouvy and I would like the data to end up in the Healt app on my iPhone.

Rouvy does not export data to my iPhone, so I installed Strava and connected it to Rouvy.

So, I do my training session with Rouvy and when I finish Strava notifies me. At this point do I have to log into Strava to make it sync or does it do it by itself?

Also, I have an Apple Watch. Do I have to start a training session on the watch too when I train with Rouvy?

It's not very clear to me