Yea, I thought the same thing for a long time (about 25 years actually) and then I started getting a double chin and I thought no more of that!  Lucky me my body actually really likes exercise, I think if I had a hard time doing it I would quit to but fortuntely for me as long as I am eating properly my body adjusts really quickly.

My ultimate goal is to get back to what I was doing about 5 or 6 years ago - cycling plus an hour of weight training or circuit training and an hour of yoga/stretching.  Sigh.  I knew I was in shape when one of the little guys I work with (about 4) wanted to run and he ran out of breath before I did!

I just miss the days of when I was a "rural" girl.  I love being able to ride on the roads with nothing but cows and fields and so little traffic you don't have to worry about it at all.  But cycling in the city is a very different experience.  Hopefully I  will find a trail I like soon then it will just start to become routine and I can just relax and enjoy the ride.