I never would have picked this book up if my mother hadn't given it to me, but it has a lot of good ideas. The author cites a ton of studies, often providing additional context in cases where the results were less than clear.
The book addresses the massive problem of inactivity and obesity in America by providing guidelines for getting in shape without letting exercise consume your life. The author also does a great job of illustrating that, as the title says, it is possible to be fit and healthy without breaking a sweat.