Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Exercise, discipline--a new lifestyle!

Bill's book is excellent if you stick with the suggestions regarding physical exercise and nutrition. It's more than an exercise book and I'd say overall it shows a healthier lifestyle. Also the nutritional programs discussed in "Body for Life" are helpful and even valuable. In short, it's one of the best books to physical fitness. Regarding the aspect of mental fitness, I really can't agree, even though the book with all it's anecdotes is inspirational and motivational, and it's fun to read. For mental fitness I'd rather recommend a book that really deals with the rearrangement of priorities and our attitudes, and a book that has helped me so much, which is Dietmar Scherf's "I Love Me: Avoiding & Overcoming Depression"-- also available at Amazon.