All of our physical features--from the shape of our waist and stomach, to the size of our wrists, to the roundness of our arms--are based upon our personal genetics, our fitness, and our health history. So one person's body is different from another's. And that means that the exercise routine that works for one individual may not work for another. The key to fitness success is a customized workout, tailored just for you That's where Ben Greenfield's...