Has anyone tried to measure a walk - run / run - jog or fartlek workout?

Combine multiple activities in a single workout

1. Open the Workout app  on your Apple Watch.
2. Begin your first workout—an outdoor run, for example.
3. When you’re ready to start a different activity—like an outdoor bike ride—swipe right, tap , then choose the workout.
4. When you finish all your activities, swipe right, then tap End.
5. Turn the Digital Crown to scroll through the results summary.
6. Scroll to the bottom and tap Done to save the workout.