I wrote a guide for people so they know what to ask and look for in a personal trainer. The guide is “How to hire a qualified personal trainer”
you can read it here: http://www.personalpowertraining.net/Hire-a-personal-trainer.htm
From a client perspective, what I think are some of the most important qualities (in no particular order) are: good communication (both speaking and listening), technical knowledge in the field, enthusiasm for what they do, being a good role model, being organized, professionalism (which can cover a whole laundry list of other traits such as being “present and in the moment” with their client – i.e. not distracted), being a good ambassador/role model for health and fitness, and being empathetic.
Our jobs as personal trainers are immensely important in that the client is placing a lot of trust and faith in us by turning a good deal of their health and safety over to us. We need to respect the role that we have been placed in by doing the very best we can for EACH client we see.
In addition to the above posts, I’d like to add:
Personality. It should mesh well with yours, and given a good connection and communication it will keep you (perspective new client) coming back.
A good listener. The trainer should hear all your concerns and address them appropriately.
A coach and motivator. They should be in your corner, training you with your best intentions (and SAFETY) in mind, always.
I see that you are a studio owner and personal trainer yourself, and I assume you want to know what traits potential clients are looking for in a personal trainer.
Here is what I tell people who ask me what they should look for in a personal trainer:
Ask about qualifications and experience and see if you can talk to a current or previous client of the trainer who may be similar in requirements to your own. For example, if you have back problems, make sure the trainer actually has practical experience rather than just theoretical one.
If the trainer is willing to train you right off the bat without any assessment, run the other way! Those famous “free personal training sessions” can come at a high price. Make sure the trainer listens to you and takes notes. You should have her full atttention. A trainer should be able to explain why he picked each exercise and modality.