I've been through London Ontario, and for the most part it's as flat as anything you can find in N. Ohio or N. Indiana. Which is to say, pretty flat. I bet you could easily map out a century that has less than 1000 feet of climbing. Centuries in S. central Michigan might have ~1500 feet of climbing, still pretty flat. That's not to say there's NO hills, but you've actually got it pretty easy. Usually when rides get the "hilly" descriptor, they're over 5000 feet/century. And when folks start bragging about hilly rides, the standard is a 10,000-foot century.