This is the receipt you land on right after finishing a workout — a quick confirmation that everything you logged is saved, on the phone or the watch.
If you built the session on the fly with Quick Workout, Finish asks first whether to save it as a routine — that turns what you actually did into a repeatable plan for next time (see "Starting a workout off-plan (Quick Workout)"). If anything you logged set a new personal record, you'll see the celebration screen before this one; tapping through it brings you here.
The summary itself shows the headline for the session — what you trained and how it went — plus any note worth calling out, like a session logged as a light day or a deload week. Tap Done to head back to Workouts. There's nothing else to do here: your progressive-overload targets, routine cache, and cloud backup all update automatically the moment the session finishes, before you even reach this screen.
Related: "Personal record celebrations", "Workout session detail", "Starting a workout off-plan (Quick Workout)"