Hey! Great question - and you're confused. :) Lawyer here, BTW, with experience in these areas.
So, copyright only protects expression of your ideas. If you write a book, sing a song, take a photo... you can get a copyright on that.
Your needs are really related to PATENTS and TRADEMARKS. Your coaching formula(e) may be patentable to the extent that it's novel (new) and secret (until you patent it). This is pretty oversimplified, but that's the basics of that.
You may be able to trademark your "ancillary terms" — for example, if you come up with a coaching method called "Roger Mother Fast", you can get a trademark on that as it relates to your business and your usage.
Trademarks, Patents, and Copyrights are confusing. Happy to help you walk through this and it's a part of my practice!