Instruct: Classify a given Amazon review as either positive or negative.
Query: Poorly illustrated. Not very helpful.

I bought this book to improve my crawl stroke and to learn butterfly. This book does not help me.The book, 8.5x11, 159 pages, has 18 chapters ("steps"). Just to give an example, the butterfly stroke occupies 4 chapters (the dolphin kick, the arm pull, the coordination, and the turn). In all these chapters there isn't a single series of complete illustration. All the figures only show this or that segment of the whole process.What's more, the drawings in the butterfly section don't even match the cover photo. The same poor quality illustration is all over the book.If you need a book to tell you how to swim like a professional, I would recommend one with actual photos (instead of drawings) of both frontal and side view. "Competitive Swimming" (from Sports Illustrated) is a better book in this sense. If you are already a pro, the final chaptor "whatermanship" may interest you. It shows how do do a few fun water games, like, forming a multiperson centipede...