I love to listen to an audiobook while I'm exercising. It helps to have something to look forward to and that also helps motivate me to exercise.
Steve Jobs by Walter Isaacson was my first one several months ago. Since then, I've listened to the Foundation trilogy by Isaac Asimov, A Christmas Carol, and am now finishing up Anniversary Day by Kristine Kathryn Rusch. All of these have great readers.
Next is Captain Vorpatril's Alliance.