I purchased this book a few years ago and I have used it constantly. It is an invaluable reference both in and out of the drama classroom.
It has a section on different types of warm-ups and games specific to skills and/or characters. So if I want to train a student to move like Arlecchino for example, it's all at my fingertips. If I want to work on general verbal impro skills, there are activities for that too.
There is another section with a history of each character which is invaluable.
I have also bought the companion book "Commedia Plays" and I use them both constantly to inform my practice and inspire me before I walk into the classroom.