Walking is a lovely exercise. End up walking to and from work from the train station (30 min each way) everyday at a brisk pace, always with my minidisc in hand.

I used to swim a lot but since moving a few months ago, I have not had an opportunity to. Need to find out where the recreation centers in the area are...

But, yes, like others have mentioned, find something that you're comfortable in doing and keep doing it. Soetimes you definately have to force yourself.