Thanks, Drone. I didn't really think anybody had come up with a solution that I hadn't at least considered, but...I thought I'd ask anyway. And it's good to know that other people have managed to overcome the "inside exercise is b-o-o-o-o-O-O-O-O-o-o-o-o-oring!" factor.
Hmm....I have a number of audio books, all on CD. I wonder if I could transfer some of those to my iPod?