Audiobooks

recommend some good scifi/fantasy audiobooks. I finished American Gods and I'm starting the epic adventure of Lord of the Rings (god help me) but basically I just want a lot of books to listen to while I exercise.

Audiobooks?  But you hardly have time to let the information absorb and form its own concepts and introspective tangents.  It would be like someone reading for you.  No flexing of the old brain muscle.  I'd hardly call that reading.