Working out or Working it Out?

I blogged over at The Susquehanna Writers yesterday about my time management during the summer months and how it stinks. One thing I do manage better in the warm months is working out. I love to be outside. When I have to be on the treadmill instead of on the road or the track, I have to have music or the TV on to keep my going.
Not so outside. All I need is one sticky plot point. Today it took me fifty minutes to work it out. Not only did I figure out the dialogue, but I put some scenes in order in my head. Now I know exactly what happens next. So my heart and legs got maxed out and I'm ready to pound out more mileage on the keyboard.
Is there an activity you do when you're stuck? What mindless activity provides the distraction you need for your creative side to start producing?