Personal trainers are there for motivation...they are there to push, and help you stay motivated through a full workout.  Many people start an exercise program, but give up part way through, or don't push through a FULL workout. I am not vouching for either side as far as Zerona, but I definitely feel like  your comment about trainers and exercise are a little off base. I can't afford a personal trainer but I have put enough money into a gym that offers classes that keep me motivated for a full workout and I am getting results through hard work.