This is a great book. As a life long athelete (skiing, tennis...), I was getting frustrated with how difficult it was for me to maintain a lean, fit body as I aged. The book reveals how the sports specific conditioning of my youth was actually now working against me. By adjustng my workouts in accordance with the book, I am now making physical progress that I know will have life long benefit. Equally important, the book is short, concise and readable. Unlike most fitness oriented books, the breezy writing never bogs down in unneccessary detail. There are literally hundreds of useful tips, and its easy to cherry pick the tips that best work for me.