Shannon Fable suggests seeking fitness products or existing services that peak your interest and offer to become a master trainer for them. These companies often need people to teach others their methods and speak on their behalf.
Further, you can offer your services as a health professional to local companies and video your work. Even volunteer your time for hospitals, or non-profit organizations with employees who would benefit from fitness know-how (all of them).
Once you have a short documented history, it’s easier to sell your previous accomplishments to future projects.