I checked it out from the library- I always do that before committing to buy a book. I'm really enjoying it and it's definitely motivating! The type of exercise is also important. You want to engage different parts of your brain so you want to mix in an exercise which challenges you cognitively like rock climbing, jump roping, karate - anything that has non-standard forms of movement.
The link he forges between movement and cognition is interesting. The school programs are fascinating. Dr. Ratey has a website BTW. I don't recall the exact number but in one of these schools 98% of the kids are fit. Compared to in our middle school where I think over half the kids are very over weight.
Like a lot of educational studies, it's not pure science - they don't have controls or the right controls but the data is interesting!
