During my walk workout , suddenly siri started announcing each km walked and time taken. This really motivated me to improve my speed. Next day siri stopped announing. On the third day, siri did not announce and then suddenly at 9km started announci

During my walk workout , suddenly siri started announcing on my airpods pro each km walked and time taken. This really motivated me to improve my speed. Next day siri stopped announing. On the third day, siri did not announce and then suddenly started announcing at 9 km. Today whilst it announced it, it kept turning off the radio that I was listening to each time

What do I need to do to set it up correctly