I went ahead and googled Pace Express Certifications and barely came up with anything.
What I did find is content that looks suitable for an infomercial, but not something I would say is a credible certifying body.
If the person who has applied for the position has extensive dance training, and has worked professionally as a dancer, I would feel comfortable with her teaching a dance fitness class as long as she also carries the appropriate liability insurance as well as a CPR/AED cert.
This is what I found on the web:
Best of luck with your potential instructor.
Wishing y’all a happy and healthy day!
Melissa Adylia Calasanz