Books like The Practice of Poetry: Writing Exercises From Poets Who Teach

Part of me wants to hate on writing-by-formula, but I like this book a lot and was interested in a lot of the exercises. It's a good read on its own, even if you don't intend to use any of the prompts. After each prompt, the author explains why s/he finds these particular constraints valuable. I liked Agha Shahid Ali's reflections on the ghazal especially. Also, most of the authors qualify their prompts as ways of making discoveries, not keys to creating perfect poems on the spot. Plus, the last section on revision sort of grounds all the creative hullabaloo of the previous chapters. Lynn Emanuel's essay is especially sobering and good.