Rachel, great question? I look at it this way, perhaps most Fitness trainers are what i would call “general practitioners” would you agree? Most Trainers have a rudimentary knowledge of the human body and how it functions (biomechanics) not to mention, priciples of physics(forces). Do you differentiate between conditioning and performance? For me if you are talking about conditioning? You mus have an understanding of the human body and all the biology and psychology applies to everyone. If it is performance? a specialty is crucial, as a goalk keeping coach in soccer, people pay me for my expertice of that particular position and yet i coach an entire team as well as coaches. Hope it helps? but i also feel your frustration.