If you are active duty, the military is banning the use of GPS watches or fitness trackers where you can upload you daily activity online. I know this to be true as my son, a Marine LT, has been told that adversaries can monitor activities on and off base, fitness routines, etc. Apps like Strava and Garmin can show a variety of data on individual fitness, performance and location.
https://www.zdnet.com/article/pentagon-bans-military-from-using-devices-with-gps/