There has been so much negativity with the term “master” trainer that I now explain it as being capable of providing instruction that will directly lead to certification or recertification as a fitness instructor. It can be a general or specific teaching area in our profession. A master trainer could be a indoor cycle class master trainer, but not a kick boxing master trainer, etc.
Pretty much, if you have the skill and ability to teach others how to lead a fitness program and have demonstrated that ability by actually teaching others to safely and successfully instruct clients in a fitness program, you should be considered a master trainer.
Often the term “master trainer” is used in the context of trainers who provide education to other trainers, often associated with a group exercise format or a piece of equipment. Often, these individuals provide certifications or trainings in that format / equipment.
Companies have very different requirements regarding education, experience, and expertise.
Actually this is a great question. Just because someone has this tile behind their name doesn’t make them a master trainer. Without taking away anything from those who are true masters of this profession, I will add that during my career I have met trainers who were referring themselves as “Master Trainers” but lucked the experience to prove it.