I think this is the best idea in the world!!! The more I think about it the more ideas pop into my head!!!
I’d say coaching along with skills training and getting the most out of people would be your best direction to go in.
On the way back last night I remembered the old gym I used to be a member at had a guy who was the trainer there. He didn’t have any formal qualifications but his experience, enthusiasm and personality made him very successful. He did pretty well from it.
But I’m not sure how this works these days whether the rules are stricter or not. I can’t see what is wrong with starting with one client you train and growing the number of people over time.
In fact, I used to do martial arts under a very famous teacher and he didn’t have any formal qualifications or training – but managed a class of about 50 people!!!
I’d say you should be fine, but see what people say on this.
B