This is not an easy question to answer. I’m not sure if there are any accurate statistics because there many who might get certified but not all become trainers or instructors. Many work on the side, under the table, part time, etc., so it’s difficult to get a clear picture on this. In my 25 years in this field, I have seen countless trainers who came and gone after only a small amount of time of working in the industry. So, the number of people who are certified doesn’t necessary reflect the actual number of active trainers. Also keep in mind that there are many who are training clients and do not have any certification (unfortunately), so I’m not sure under which category you can place them.