I will admit I am not the best trainer in the world nor will I say I'm a good trainer. I just know how to put together workout programs and execute proper technique.
Just look around at your gym and if you see them doing something that looks "funny" just don't do it. For example, this woman was on the treadmill jogging. She doesn't have the most athletic build in the world but could run further than me. This other more attractive woman started up the treadmill beside her. She started in a side skip and a very slow pace rotating side to side then backwards. She then ran for 15 mins cooled down and ended her "cardo" session. The non-athletic woman tried to do the same thing. Well, needless to say, she ended tripping over her feet and fell on the treadmill which carried her off on to the floor with her head repeatedly bouncing off the conveyer belt.
We employee at the gym got a pretty good laugh but have never seen this woman since. People, use common sense and be polite to the other members because they pay the same dues you do.