Instruct: Classify an Amazon review as either positive or negative.
Query: Could work for some

Interesting facts in this book, but errors, too. The most serious error is the assumption that multifidus will tag along automatically. For those that it will, this might work perfectly. However, I've understood that it is for some of us absolutely critical to learn to voluntarily contract our low back multifidus as well. And that important part is missing in this book. (In my case the right side multifidi in my lower apparently didn't kick in during light activities for 8 years. When I was taught to voluntarily contract the multifidi they started contributing. This fact is based on scientific studies and you can check it e.g. inTherapeutic Exercise for Lumbopelvic Stabilization: A Motor Control Approach for the Treatment and Prevention of Low Back Pain)I would recommend Rick Jemmett's book on Spinal Stabilization instead. That is a buy you won't regret!