Mike O’Hearn has been a major figure in the bodybuilding and fitness world for nearly 40 years. Most amazingly, he has maintained an incredible physique completely all natural. For his entire career, fitness fans have questioned his all natural claims. In our interview, we discuss topics such as whether or not O’Hearn can spot a fake natty athlete, the secret to his all natural physique, and the key advice he received from Joe Weider.