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I returned this book. I wanted a workout manual filled with exercises. This is literally an Anatomy & Physiology textbook of the glutes. That’s fine if you’re a science geek and want all the details on muscle fibers and how & why a movement is necessary for specific muscles and all that jazz. Only about 15-20% of the book is useful to someone who just wants exercises. The rest is Bret’s life story as well as science and research. It’s so huge and cumbersome that i wouldn’t take this anywhere