I thought one of the most valuable parts of Wilderness First Responder class was the improvisational training. There are no real rules to improvisation, of course, and in theory anyone can just jump right into it. But it's really useful to work with people and to practice a few times in different scenarios, with different equipment, etc. It gets your mind going in the right direction, and you pick up ideas and techniques. The mindset is more important than the techniques.

Also, improvisational practice is just a lot of fun -- both for the pretend victims and for the pretend rescuers.