Here are a few thoughts that I offer to people who want to be personal trainers at a gym, or maybe I should say “who might want to be my personal trainer at a gym:”
Introduce yourself to me by first and last name. That is how adults introduce themselves to one another. If you are afraid that I might turn out to be a stalker, number one: you flatter yourself, and number two: you really should avoid any interaction whatsoever with anyone you are afraid might turn out to be a stalker. I am not going to pay you a good hourly rate each week to spend some time in your company if I find you even the slightest bit rude or insulting.
On the topic of being rude and insulting, avoid saying anything that might seem rude and insulting. Don’t tell me that if I don’t do the exercises you recommend, I’ll soon have trouble getting up from the toilet seat or that I’ll find myself falling and not being able to get up. “Don’t go there, girlfriend!” as one might say.
If you ask me what my purposes are in coming to the gym and I tell you, then please recommend exercises that correspond to my purposes. Make it clear to me how they correspond to one of my purposes. Do not create a situation where it seems you have paid no attention to anything I have said.
Recognize that I am a person of intelligence and experience, not some old jerk.
If I say I don’t like an exercise, that is a big red flag that you should not brush aside if you actually hope that I will hire you.
If you have had serious mental health problems in the past, well, that is as it may be, but try to seem normal and happy in the gym, which is your workplace but not your home. I won’t want to spend time with a gloomy brooding person.
Explain what every exercise is intended to do. What are its supposed benefits etc.?