original714 saidAlso, double-check that your gym will allow an outside trainer to accompany you. The few gyms I have asked about in Pittsburgh all require the use of their trainers for 'insurance purposes'. Very frustrating.
That is because house trainers, like wait staff or beauty staff, depend on commissions. They should not have to compete with outside trainers who can charge an hourly rate that does not include all the overhead (equipment, insurance, etc.) a gym has to buy.
Some other reputable certifications to look for:
NASM (National Academy of Sports Medicine)
NCSA (National Conditioning and Strength Association)
offers the CSCS (Certified Strength and Conditioning Specialist) certification
there are ways around using in house trainers, even at gym that don't allow outside trainers. If you bring in your own trainer, just make sure they workout also, like doing each exercise in full sets first, it looks like they are just a training partner.
Some gyms allow independent trainers. i know a few that have independent trainers as contracts, they just pay a monthly fee to the gym to use the equipment to train their own clients. Some just make the trainer and their clients purchase a gym membership, and some others that have the client as a member just charge the trainer a visitor fee each time.
If you want an outside trainer, find out what their policy for independent trainers is