Not Sure Why I Didn't Think Of This Before

I am now officially an adult. (It only took 30 years.) I've just finished uploading a new bestselling fiction audiobook to my mp3 player to keep me company on all of the long miles ahead of me on the eliptical machine at the gym. And the best part about it? If I want to finish the book, I'll have to keep returning to the gym. Why am I just thinking of this now?