Do not avoid hills. Embrace them. Attack them. Leave them whimpering in your wake as the pathetic nothings they are.
[Conversation with the wife on a ride yesterday: Her: "Why am I pedalling and you're coasting?" Me: "I'm in a different gear." Her: "Well, tell me what number gear you're in so I can start coasting." Me: "There aren't any numbers to tell you." Her: "Why do you always do this to me? You know there's a gear where I can coast just like you are, but you won't tell me what it is."]