It is difficult to say with certainty which is the best personal trainer certification program because hardly anybody goes through all of them. If a person gets certified through the American College of Sports Medicine (ACSM), for example, he or she most likely won’t have first-hand knowledge of other certification organizations, so any comparison will be somewhat incomplete. Furthermore, people can have very different opinions on the same certifications based on different experiences and goals. That said, it still can be useful to take a look at recommendations from personal trainer Mosman, and thanks to the internet, we can easily see what people are saying.