See, I've never really thought of it as hilly, though I suppose it is. Most of my riding in Cincinnati has been on a false-flat bike trail. It follows the Little Miami, so it slopes downhill as you go south. You don't really notice the slope, you just notice that it's a little harder going north than south. Of course, my neighborhood is pretty hilly, so shows how much I notice.

Cleveland, apart from a ridge on one side of the city, is pretty flat. I guess that's what happens when you get run over by a large glacier.