Wow! Congratulations! Our ride today had hills too, and lots of them! And like you, I'm not sure just what constitutes a hill in most folks mind, but any time I am going up, even just a little, my body says, whoa, hill! Our hills were on the second half of the ride, so most of 22 miles was generally uphill. Most of it was pretty minor, but it was still up, and hours later, my legs are still complaining that it was up.
BUT -- like you, I enjoyed them today! I grumbled some, but the thing is, I didn't stop to rest or walk on any of them, even the ones that I usually would have!
Must have been a good hill day!
Karen in Boise