Personal Trainers How Don't Train Correctly

I was just working out in the gym and saw a trainer working with somebody whom I know. They were doing abs. It was a poor work out by my standards in both technique and methodology. But to make it (FAR) worse, I was leaving the gym and saw the person again and told her that I would call her to give her some pointers. She told me that she was going back in to do legs. This AFTER doing abs!!! This is TOTALLY horrible. Abs should ALWAYS be done LAST in your workout...PERIOD!! They are the support system for everything that you do. If you are going to do squats with fatigued abs...I smell potential injury!
Another day I saw a client doing her abs with a trainer and she had a towel around the back Of her head and to her hands. She was pulling on the towel to aid in her crunches. The potential for injury here is ridiculous! How a trainer could do such a thing is beyond me.
People, PLEASE do your own research and go into your work outs with some knowledge of hwo to train. Don't take these 'experts' for everything they say. Unlkike medical (where there is a bit more professional standards) these trainers do what they want and don't always follow BASIC principles.
FIRST- BIGGEST MUSCLES to SMALLEST. Legs, Back, Chest, Shoulders, Arms, Abs.
Second- Don't support your head doing abs. If your neck muscles aren't strong enough to do this don't you think they should be?
There are more things that I could go on about but keep these in mind for a much SAFER work out!