Telling me “I can’t do that” seriously people, I wouldn’t try to have you do it if I thought you weren’t capable.
Probably the biggest one in the gym is when the client just won’t put in the effort no matter how you try to motivate them.
My biggest frustration outside of the gym is when someone tells me “I’m not fit enough to join a gym”
I don’t really find it annoying when the client tells me something hurts, that may be a sign or symptom of an injury and as a trainer I WANT to know about that before we start. Ad for them telling me about personal or non-exercise problems, hey, we all need to vent once in a while and I’ve used that a few times to motivate the client. If nothing else, it shows that we are compassionate and understanding.