Oakleaf - thanks for your comments. I keep meaning to ask my chiro about that, but currently my shoulder has top billing and I forget I will check out the exercises on the link you provided.

The MobilityWOD website'Supple Leopard book has some good information on heel/calf work, and I also have Brian McKenzie's book on Crossfit Endurance (he focuses on Running/Cycling/Swimming mixed with Crossfit workouts. I think he has some foot work in that book as well. He also has some excellent videos online that address beginning running and trail running.

I know some appear to insist that trail running is more advanced than pavement running and it isn't the best way to start - but I just can't tolerate running on the pavement.