There are so many activities on the Fenix 5x, but none at all for any rack to sports....e.g. Squash, Tennis, Badminton etc etc. These are far more popular activities than some of the others already available. Why not??
Because us racquet lovers are not loved. I gave up and just record my tennis matches as a run. Someone made one for tennis on my old vivoactive and it was just awful so I gave up.
Could you not add a custom activity type for this yourself?
If you need it to have some special functionality (score keeping etc.) then maybe nip down to the ConnectIQ forum and request someone make it, assuming there isn't already something on the IQ store.
Have you checked for CIQ apps in the store? I seem to recall seeing things there. if they aren't ready for the f5x/f5, you can contact the developer to see if the f5 devices could be added.