This was okay. Most of it was pretty common sense stuff that I already knew: exercise is good for you, different kinds of exercise are good for different things, eat in moderation, mostly plants, get enough sleep, don't multitask. I was impressed by the facts about how important sleep is and how many people don't get enough, but I definitely am not one of those people, fortunately for me. The four areas are somewhat connected, but I feel like the book didn't really play this up that much, and again, it seemed like common sense. I know that a lot of people like the 1% tips (suggestions for how to make small changes that will lead to bigger effects), but again, I found most of these were unremarkable and common sense. The only one I think I'll implement is the one about waking "naturally": the idea is that you go through a full sleep cycle every 90 minutes or so, and the best time to wake is when you have completed a sleep cycle, so you aren't tired and disoriented and sluggish. So if you wake up naturally a little earlier than your alarm, don't go back to sleep unless you can get another 90 minutes, or you'll have to wake up in the middle of a cycle and be more tired. We'll see if I can actually implement this...an extra hour of sleep sounds pretty good in the morning.
I did like the emphasis on small steps: move more during your day, even if it's only going for a 10-minute walk or taking the stairs. Every little improvement encourages more improvements. Overall, I don't think it's worth reading the whole book if you're already pretty sensible and know the basics about good sleeping, eating, exercising, and thinking habits.