Hello @RussellGilbert and welcome to the Help forums. That walk/run/hike option is a feature called MobileRun and is Fitbit's first feature that allowed GPS tracking. This was released well before Fitbit had an Exercise app on the device and the algorithms to track biking (or anything else). It is still available because there are still devices in use that don't have an Exercise app. It also gives voice prompts. Devices can only give vibration feedback.
Laurie | Maryland
Sense 2, Luxe, Aria 2 | iOS | Mac OS
Take a look at the Fitbit help site for further assistance and information.
Best Answer