Posting this question merely out of curiosity.
I have a ton of playlists for working out, or sometimes I just put my iPod on shuffle to see what happens. I find that music drives me along on my workouts...I tend to think "oh, I'll finish at the end of this song" or "ooooh, I forgot about this tune...I'll just stay on the treadmill till it finishes".
For those of you who don't listen to music when you work out, what do you do? I notice some people in the gym not listening to anything which isn't quite bizarre to me, it's just a totally different behavior that I don't think would work for me. (I've been known to drive into the office in my workout clothes on a weekend when I've left my iPod at work because I can't bear the thought of exercising music-less...I may be hopeless!).
What works for you?