In my opinion, the answer is yes.
The windows-10 tag is not consistent with other version tags and it could raise some confusion with the desktop version of Windows 10.
I think too windows-10-mobile or 10-mobile will be better tags instead of the current one.
Using the name of the app (so health-fitness or msn-health-fitness) is always an option, if no generic term can be found that's intuitive enough.
A few alternative suggestions:
"Activity tracker" seems to be a generic term for devices/apps that track health-related metrics.
Specifically about fitness, if you want to ...