Have you ever seen another Personal Trainer do something completely off the wall with their clients?
Ok, I’ have a somewhat different “read” on the question.
To me, “off the wall” is unusual or very different, NOT dangerous, neglectful, inappropriate, etc..
Off the wall can mean different things in different gyms. At a “sedate” local gym where the free weight get more attention from the cleaner than all the clients combined, just doing squats could be off the wall.
I’ve seen it, I’ve had it done to me, I’ve even done it a couple times. Sometimes it can be a good thing, I had a client doing planks and plank rows at a facility that really didn’t have much personal training done there and had people come up and ask me if I had just “made that up”, once I explained the purpose of the exercises, many of them realized that I am a professional, not just someone who knows “how to lift weights”.