Hello Hugo Santiago,
How have you been doing? I find different ways to get the message through and lead by example. Many personalities are in the fitness industry as well as life; so, it only takes a love of the career to be successful. Maybe the trainer and client need to look elsewhere for a better personality match which is all well and fine.
NAPS 2 B Fit
If it seems like my message isn’t getting across, I try to communicate it in another way. A lot of this can be mitigated by determining up front how committed an exerciser actually is to adopting an exercise program.
Introverts can be successful. I’m an introvert, and fitness is my career. As Karin mentioned, we are always being watched when we train. People watch who I train, how I treat them, and what we do.
I try to do well, quietly but visibly.
I suspect you have a specific client situation in mind; my answer is somewhat generic, since you have not been specific.
I am not sure how you define a ‘difficult’ client. Do you mean somebody who is not compliant with your exercise recommendations? I find that you need to meet with client where they are and talk at the same frequency. To use exercise compliance as an example: there are recommendation about how much and at what intensity a person should exercise per week, and, as trainers, we try to nudge people toward that goal. But if they are not ready to such a commitment, then your gentle nudging will be perceived as unwanted nagging, and you will not succeed and even turn off the client altogether.
An introvert personality may have a harder start as a personal trainer in getting clients. A person of that inclination rarely toots his or her own horn even if the qualifications and knowledge are there. But if you can demonstrate through results that you are a good trainer, then people will notice. Particularly when you train at a gym, you are always observed by many more people than your think.
Hope this helps.