I have taken the Functional training workshops from ACE and I thought highly of the experience. Great workshop. The materials and teacher were both excellent. I researched a lot on the Functional training speciality certification. I was considering it. They had an offer to save you the cost of the trainer certification renewal fee when you purchase the a speciality cert. I read all the reviews on the course materials that were bundled as part of earning the functional training certification. Many people gave poor reviews on more than one of those course materials. So at this time, I was not convinced about the level of quality. Also, one of the courses in the required bundle was already included in the 4th edition ACE trainer’s manual bundle. I would then have had to buy a duplicate. I look forward to taking another look at the ACE Functional Training speciality certificate when new and updated or edited course materials, for both the videos and textbooks, are available, and the trainer certification renewal deal is on.
I have not done the Functional Training certification by ACE, but I did take their full day workshop on Functional Training and Assessments a few years ago. It was a wonderful workshop and very informative, educational, and had outstanding materials. It was very useful for everyday training. I know this isn’t the same as the certification, but the workshop probably covered some of the same materials.
Any ACE certifications and workshops that I’ve done have always been very good. Not sure if this will help you, but the knowledge you will gain from the cert. would certainly help you with your clients.