Xiaomi Amazfit GTS User Manual page 29

When the set goal is achieved, the watch will vibrate to remind you.
2、 The workout reminder supports five types: distance, pace, safe heart rate,
heart rate zone, and speed. With a reminder set, the watch will vibrate to
remind you as long as the set value is reached during workouts.
3、 With the auto pause on, the watch will automatically detect the workout
status. When the workout is stopped, the watch will automatically suspend
the current exercise. And the watch will re-record the data when the
workout is resumed.
4、 The real-time diagram supports demonstrating the real-time heart rate and
pace. With the real-time diagram on, a curve is drawn for the fluctuations of
the heart rate or pace during workouts.