Instruct: Classify a review into positive or negative sentiment.
Query: Not for the faint hearted...

One could never expect a book by Duchaine to be simple to follow nor easy, but one would absolutely expect it to be effective. And that's exactly the case here. Despite the actual Body Opus portion of the book being very small, it definitely works.It's not the easiest diet to follow, the 2 hour+ glycogen depletion workout is an absolutely killer - but the results are indisputableThe book does have several flaws. Dan negates to include a lot of information (how much protein one eats on the weekend, dosages of the the supplements he recommends... etc etc) and parts of the book are woefully inadequate (the training sections could definitely be beefed up) - but perhaps that's because some things aren't an exact science and different methodologies work for different people.Regardless, highly effective and a definite must read for anyone serious about getting in shape.