Having the same issue... And there's no new release version of xcode available to download.

I had the same questions as you when developing an app that uses WorkoutKit. It is indeed a shame that the documentation is really sparse and that the WWDC23 videos are more of less obsolete because the APIs changed so much. Anyway, here's what I found: No idea about that. I just do/try/catch. I did the test a while ago on iOS 17 and I noticed that if you go past 50 workouts, it "wipes" the existing ones and start from scratch. No queue logic. I didn't try with iOS 18 though, so hopefully it was improved... Would really like to know about that as well. I did notice though that past scheduled workouts do not count in the 50 workouts limit. Would be nice to have official documentation on those above points. Let me know if you discover anything else!