Anybody know a good way to learn Stage Combat??

I'm a senior directing a 10-minute scene for a cl. Part of the scene is really, REALLY intense ... and I know how I want to direct it; unfortunately, the university hasn't offered a Stage Combat course in years. The scene doesn't involve dangerous weapons, but it does require some quick maneuvering of the characters involved. They need to know - in particular - how to roll and fall safely ... and it's up to me to show them. Any ideas on REALLY good visual training aids?