The only way to get verbal cues is starting walk or run from phone app: Days of Exercise Tile > stopwatch at upper right > Tracking. Only options are Walk, Run, Hike. And need earphones to hear, connected to phone. I've only done it with corded ear pkugs, but suppose can do via bluetooth too.
To complement what rightfully @JohnnyRow said: bear in mind that in this way your Sense will become useless. In fact not only the data won't be shown on the display during the session but even after the session the heart rate measured by the Sense won't be included into the session record. This is true for every Fitbit device.
@MichelleLynne Please vote for and leave a comment on this Feature Suggestion. I know there are many runners who would love to have this feature. MobileRun, the feature mentioned by @JohnnyRow, used to track your heart rate. I used to use it! The Versa 3 and Sense certainly have the hardware to do this.
Laurie | Maryland
Sense 2, Luxe, Aria 2 | iOS | Mac OS
Take a look at the Fitbit help site for further assistance and information.