This is not a book about body building! It is a book about achieving maximum strength, speed and endurance. Unlike bodybuilders, who do not have to perform on the playing field, athletes should never train heavy all year long.The most a body can take of any heavy weight program is about 60 minutes. After that, hormone levels start to decline, neural fatigue sets in, and further weight work will not increase muscle power, or even muscle mass. And to back up his claims, Colgan sites mountains of scientific evidence.