When you reach your goal, you hear a tone and feel a vibration. If you’re feeling good and want to continue, go ahead—your Apple Watch continues to collect data until you tell it to stop. When you’re ready to end your workout:
Go to the Workout app on your Apple Watch.
When you’re finished with your workout, swipe right, then tap End.
Turn the Digital Crown to scroll through the results summary, then tap Add Effort.
Turn the Digital Crown to indicate your effort, then tap Track daily activity with Apple Watch