Fitness professional

A fitness professional is a professional in the field of fitness and exercise, most often instruction (fitness instructor), including aerobics and yoga instructors and authors of fitness instruction books or manuals. Fitness topics may also include nutrition, weight-loss, and self-help. Fitness careers are distinguished from exercise science careers such as athletic training, however the various types of fitness certifications  have more and more in common: the, "distinctions...have become blurred, with more similarities than differences given the common background that all fitness professionals must possess."