Not long ago, I used to be able to “grab” the progress indicator during a workout, and move it forward (to skip an interval) or backward (to repeat an interval) on MacOS.
Today, I found that functionality is no longer available. Also tested on Windows and Android.
Its on iOS now… unless it’s only in beta. I think you need to be paused to get it to work, but I just pulled up the app and tried it.
I also recall it working way-back-when on Windows, but the last time I tried it there was pre-mobile apps. I think the windows app was still Adobe Air based then.