It's unfortunate that he has to use techniques like gain 28lbs of muscle in four weeks (or similar hype) to sell books. Clearly that's manipulation because even if he gained that many pounds in a month, he definitely didn't gain that much muscle. He's stretching words more so with 4HB than with 4HWW.

HOWEVER, he has data to back up a lot of his claims and a lot of the tips he gives are great. So if it takes some of these techniques to sell, maybe it's worth it. His books are a lot more substantial than other self-help books.