For certifications, which organization has the largest active licenses? ADVERTISEMENT 447 viewsFebruary 2, 2012 0 Brad February 2, 2012 0 Comments 5 Answers ActiveVotedNewestOldest 0 Andrew0 Posted 0 Comments I believe the American Council on Exercise has the highest number of actively certified trainers. It is a more affordable certification and a great one to start out with. I am very pleased I chose ACE and I plan to purchase more materials from them. You are viewing 1 out of 5 answers, click here to view all answers. Register or Login