Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Best Fitness Book in the History of Time

This book outlines a very readable, very achievable program that is easy to follow, and yet feels challenging enough to feel effective. It begins assuming you have never tried an exercise program before, and that approach is helpful and always boosts self-esteem.Personally, I found this book perfect for me. I am nineteen and at college. I had mononucleosis for over a month. While I was recovering, I found that all my muscles had become very weak. I needed something to strengthen me again, and I browsed many exercise books before choosing this one. It helped me build good, healthy habits, and I do not feel like the exercise program is consuming my life, which is a good thing, as I am always very busy. I completed the ninety days mentioned in the title, and already I feel much stronger and healthier than I did when I began. I have lost weight and I feel like dancing a lot more than I used to. I wholeheartedly recommend this book.