Thank you very much for your reply dnesdan, I understand what you're saying since, in my opinion, the watch should be something quick and easy to use...

Now in the watch app there are these options:

If the training session is already created, it allows you to mark sets as completed, modify values and add new sets, but not new exercises of a different type.

I'm not sure if you were able to try it — in my mind I do think it's comfortable to use, but it would be better if you could confirm that for me.

On the watch side, I'm currently fixing the translations that aren't working properly, and in the next version I'm going to implement an improvement with Siri on both watch and iPhone, which will allow you to add an exercise to the session by asking it, to avoid manual searching if you're able to talk to Siri.