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You should expect them to have the knowledge and the qualifications to teach fitness and to be able to get you in shape. The trainers who are serious about their work will have taken the time to make sure they have qualifications to acknowledging their grasp on the basic theories and models for fitness. The right personal trainer however, has probably more than one qualification acknowledging their interest in multiple subjects in the areas of fitness, health and diet.
You can also expect your personal trainer to practice what they preach. You can expect they will lead by example and that they are there to help you keep your eye on the ball. Often the right personal trainer is someone who has overcome obstacles of their own and therefore understands the challenges you are faced with. The best personal trainer for you is very likely going to be in great shape. The good physique serves as the positive role model helping you to focus on where you want to be.