Any Aaptiv/Series 3 users out there?

I have been using the Aaptiv app on my iPhone 6s and my Series 3. When I run Aaptiv on my phone and Workout on my watch, Workout overwrites Aaptiv's estimated distance, calories, etc. (as I have set it to do). In this case, listening to Aaptiv is like listening to music. But on the watch, when I start Workout and then Aaptiv, Aaptiv causes the workout to end. Any way to avoid? Should I start Aaptiv first? Or it is impossible to capture Workout data if both apps are running on my watch?