My DD (8) refuses to do any activities/hobbies. Lots of this is due to anxiety. She will only try things if they interest her, and the things that interest her are On a screen (Robux, minecraft, Pokemon). She loves animals and thus only sport she is willing to try is horse riding.
I'm trying to think outside of the box to find her out-of-the-house activities she might try.
Her DF gets v frustrated about her lack of activity as both he and I had lots of hobbies growing up. DD just wants to do sedentary things.