Last night I started reading a book on teaching and directing Improv by Viola Spolin, one of the pioneers of improvisational theater. It was extraordinarily thrilling to find the first paragraph of her book summed up everything I've believed about Improv since day one:
Everyone can act. Everyone can improvise. Anyone who wishes to can play in the theater and learn to become "stageworthy."
That's all I've read so far. I got so excited that I was going to love the book that I had to put it down and go to sleep. :)