While you arrive at the gym and expect to have a personal trainer to assist you, it doesn't mean you have to take the first trainer you meet.
You are allowed to make your selection based on what makes you more comfortable and who you believe is going to provide you with the finest level of personalized service to ensure you reach your fitness goals with ease and confidence.
Not all gyms will provide you with detailed information on each of their personal trainers. But you are welcome to ask what they have specialized in. What type of clients they work with. You can then make your selection based on what you feel is going to work best for you and that you believe will help you achieve your goals in the long run.
Remember you are going to be working with this person at least three times per week, so you want to ensure you get along and that they provide you with the motivation and support you need to train properly and effectively.
Identify their assessment requirements. You will find a high number of fitness clubs and private personal trainers will ensure you sign up for a certain period of time before they will conduct a thorough assessment to provide you with your tailored training programme.
But on your visit, you are always welcome to speak to them and see how they think your training programme should go based on what you want to achieve. Of course, this will change as your assessment is completed.