Sort of tricky to answer your question.
I hold the ACE AHFS credential. Earning this credential was natural professional progression for me.
At the time, I was employed by a company that is vendor for corporate wellness. Some of the employees there presented with various clinical conditions. I took advantage of that opportunity to accumulate the necessary hours working with these populations so that I might earn the clinical credentials in our industry. In order to qualify for the AHFS you must have documented evidence that you have a minimum of 300 hours “developing and implementing fitness programs for individuals with special needs or who are at risk or have received medical treatment for a disease or medical condition and have been cleared by their physician for participation in exercise and physical activity.”
Have said the above, if you are already doing that this makes you already very marketable and earning the credential only enhances it.
Hope this helps.