In The 4-Hour Body, Tim Ferriss spares us some of the grueling self-experimentation required to separate the good from the bad in today's fitness industry by doing, journaling and digesting 10 years of experiments on his own body. The result is a convincing trip around and inside the body, a trip on which you will go from reversing permanent injuries to running a full marathon and more, all the while having the best sex of your life and losing more weight than you'd care to. Not only that, but you will also learn along the way some science and some skepticism for yourself, so that you can sift through McStudies and not be taken in by trends or bad evidence.
Some will say that experimentation on oneself can only yield anecdotal results. They are right, but Tim Ferriss is well aware of the weaknesses of his approach and in every chapter he urges you to experiment - safely - on yourself, using his results as a starting point and his mistakes as a cautionary tale.