What things/foods/activities etc that are supposedly good for you, healthy or "improving" do you dislike?
I really hate being read to, and I hate reading to people. I never particularly enjoyed being read to as a child, though I appreciate that my Mother did so but I think it was a relief to both of us when I was able to read a book by myself. I also don't enjoy reading to people though I used to have to do so when I worked in childcare and as a volunteer role that involved reading aloud. I've no children yet but if I do I can't say that reading to them will be one of my favourite activities.
Walking. I hate walking for the sake of it. I can happily clock up a lot of miles walking through cities and towns when I'm shopping or seeing the sights. Or if there's a lot of wildlife to admire on a country walk, but I don't enjoy walking as an activity. If I go for a walk for the sake of walking I'm aware of every bloody step and find it boring.
Camping: I love nature and wildlife but I much prefer to admire it and then return to a comfortable bed with solid walls and a sturdy roof over my head. Each to their own but I've tried it once and it was hell. Never again.
Dark chocolate. I don't mind a thin layer of dark chocolate with a mint or caramel filling, but I can't eat dark chocolate on its own. I don't care how good it is for you or how unsophisticated it makes me, it is so unpleasantly bitter that I can't enjoy it. I'll stick with milk chocolate.
There's probably more but that will do for now.