This made me want to read Atomic Habits again because that was such a better-written book. I saw another review state that this one reads like an infomercial and I completely agree. With all the talk about the conferences and certified coaches, it really feels like he's trying to sell you something. I didn't find that necessary. I would think that most people choosing to read a habit book already believe in behavior change and trust the author's expertise to some extent. Plus, the amount of definitions he created felt excessive and took away from the core information, for me.
There are some valuable tools here, though. First, the act of celebration is something I haven't seen in any other habit methods. I'm not a peppy person by nature, but I will be using this tool in my habit journey. Sometimes habits themselves don't bring us enough joy and satisfaction (especially at the beginning), so it would absolutely help to do something to force yourself to feel good and accomplished after you do a new habit. Second, the recommendation that you rehearse a habit multiple times before inserting it into your existing routine probably helps. This is something I came across while reviewing research on sleep habits while getting my Psychology degree. I haven't tried it yet, but plan to now that this book helped me realize my unreliability getting out of bed on time is really going to limit my ability to incorporate positive habits into my morning routine. Lastly, the author takes the concept of the small habit further than anyone else, and that will really help some people.
Overall, I think maybe a book just wasn't the best vehicle for Fogg's expertise. I bet if I heard him give a speech it would come out more authentically.