Someone said that it never gets easier - you just go faster. Also, if you end up where you started, it averages out to dead flat road. Well, that's about it for the encouragement, but it is more fun, isn't it?
Oh, where ever the downhills are, that's also where you find the tail winds.
__________________
Some people are like a Slinky ... not really good for anything, but you still can't help but smile when you shove them down the stairs.