I currently take my phone with me while running, but it’s very annoying to take imo.
Like the title says, is there a privacy friendly smart watch that could track my sport activities?
Bonus if it can also sync the data to my private server / NAS :D
You could use a Garmin and disable the normal syncing. You can plug it in as USB device and access the activity files that way.
You could write your own automation to process the files when the device is detected on the USB hub.