No idea what to label this thread so that's the best I could come up with.

I enjoy walking the dog or just walking the treadmill several days a week when possible. Now I'm trying to think of a way to study while I exercise so that I never use the excuse "that time could be spent better studying". I'd like to figure out a way to use my ipod to listen to something that is connected to what I'm studying. I'm just not sure how to go about this though. Anyone know if there are things you can download that might be good learning tools. I don't know if this makes sense or not. With a family of 3 kids I'm hoping to be able to utilize every minute I can.
thanks!