Instruct: Classify an Amazon review as either positive or negative.
Query: Precious little useful information

I very rarely write reviews, but felt compelled to review this book. This book is basically useless. You will learn precious little to improve your tennis game. It is poorly written, and consists mostly of a lot of hemming and hawing about how few proper scientific studies have been conducted on this or that aspect of tennis. I got a lot more out of Cross & Lindsey's Tecnical Tennis, from the same publisher.