You know the books that should really be a blog post? This is not that kind of book.
This book should be a really good tweet, with some room to spare.
This is a kind of book where 95%+ of value can be condensed into literally one sentence. The title gives away half of it. Here it is: "If you have an instinct to act on a goal, you must physically move within 5 seconds or your brain will kill it."
That's it. There's nothing more to it. Not a single thing.
The full title of the book is The 5 Second Rule: Transform Your Life, Work, and Confidence with Everyday Courage but that seems like overkill.
Given all of the above, it may not be a bad thing. I knew full well that there won't be much of actual content beyond the core rule. And there was even less than I thought it would be. While it was infuriating, I was ok with it. Knowing beforehand, I wanted this one idea repeated over and over, so that it sticks.
If you read a smart tweet, you're less likely to dwell on it or remember it a week from now. If you read a book that should be a tweet, you'll remember it a year from now. This was exactly what I wanted.
The author was trying really hard to put more meat on it.
In short: the idea is good. It's worth remembering and acting on it often, making it a habit. The book is not good as a literary piece of work but a good one to hammer the same thing into you from all the angles, even from the ones that don't make much sense.