Note that what gyms advertise as "professional" is subjective. The weekend seminar some trainers get their certs from is a whole world apart from something like a nationally recognized cert like an NSCA, ACSM, or NASM cert. Then there's varying levels of certification, are they a personal trainer? Group fitness instructor? Cancer/post surgery fitness therapist? Or hell, even a tactical (think for the added gear of police, fire, and EMS) fitness instructor. There is a MASSIVE disparity between the level of knowledge in today's community of fitness professionals, which is something the industry is slowly trying to address.