Originally Posted by
roka
My wife and I are retired. We ride our bikes almost everywhere we go. We bike to lunch, shopping trips, visiting, the library, etc. So is this commuting? I don't want to claim false credit.

For the record, according to
http://en.wikipedia.org/wiki/Commuting
Commuting is regular travel between one's place of residence and place of work or full time study.
That said, it's up to you to decide if you really care how it's defined or what anyone thinks about what you and your wife do.
I say, more power to you both for the exercise advantage you have over the sedentary population.