Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Extremely Motivating Coach and Book

Buy this book today, whether you are beginning a running career, or are an sesoned road racer, coach GP's style and knowledge make this book a must-have for your running library. His infinate knowledge on biomechanics (especially, for me, proper footstrike and armswing) will have you running Taller, Easier, and FASTER!