I am a mental health therapist as well as a fitness professional is there an exercise therapy certification to bridge both
Carrie,
I believe you would be well impressed with the Wellcoaches credential. They offer both a 13-week course, which I have taken and it has thoroughly improved my skills as a fitness professional, in addition to to their 10-month course.
I encourage you to visit www.wellcoaches.com for more information.
Best!