Does anyone know who is the overarching organization that decides if a company has a valid certification based on best practice principles? Is it ACSM? There are some certifications that people get now-a-days that don't even require a basic knowledge of anatomy, physiology or...well....sometimes all you need is a checkbook and poof! like magic you are certified to teach! This is oftentimes an insult to our industry in my opinion.
This however is definitely the wave of the future in our industry, and in my opinion, several States are initiating legislative bills just for that reason.
My understanding according to ACE, as Joanne listed, is that NCCA provides this service
....and as we use often on the National Coalition for Promoting Physical Activity council - NCQA provides a quality control of activity metrics
http://www.ncqa.org/ is an agency for quality control.
ACSM is a certifying body that practices research supported metrics.
It's also frustrating that people can be "fitness professionals" and be sell-outs so they can make money on just about everything. This confuses the public even more about nutrition and exercise.
A part answer to your question is that ACSM is basically what other certifications look to as an example. ACSM does require you understand biomechanics, exercise physiology, human anatomy, and some nutrition.