Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Author's History and Common Knowledge

Book is supposed to be about the grippers and methods of achieving their closure -- title reads: What They Are and How to Close Them. Instead, it's about the author's (and mostly Ironmind's since they're mainly a grip company) history and some useless general tips. For the history, just do a search and you'll find it all there in one page if you REALLY want to know the story. It's irrelevant to actually knowing the grippers and how to close them. I say useless tips because they're obvious facts that anyone who has done any reading about muscle gaining at all will know them. It was as useful as fortune teller.