Instruct: Classify Amazon reviews into positive or negative sentiment
Query: FLUFF

This book is mostly fluff. Everything important in it could be well written in about 10 pages. The workouts which comprise about half the book are quite useless. If you want to find out what race walking, power walking, and fitness walking are all about I recommend "The Complete Guide to Racewalking: Technique and Training" by Dave McGovern available here at amazon.com.