Whoever said that using a personal trainer is for lazy people is either not a personal trainer or not a very good one.
There is a lot that goes into being a good personal trainer, a lot.
When I was working at the last gym, I was being paid about $20 an hour and I didn't know my ass from a hole in the wall, but I looked like a personal trainer.
I decided to start studying, and the next thing I know I can blow doctors minds with some of the stuff I know.
I will be charging $30 an hour to any gym that I work at, and $50-75 an hour for my personal clients very shortly here. There is something to be said about a trainer that knows enough not to overload the body with the wrong stuff (I am referring to everything from nutrition to mechanical stress).
Client want tid bits of information that they can USE, and put into Practice. Immediately.
resistance Training.
Posture, assess their posture, then in a gentle way explain it to them, then show them how to correct it, FIRST by showing them the muscles with an anatomical picture, then with exercises.
Explain breathing patterns, and blood pressure responses. (explain what blood pressure means if you have to)
Cardiovascular, explain what it means to lower your resting heart rate, and how that reduces the stress put on the heart. Then, once they understand that a lower heart rate at any given amount of workload is good, then explain to them how metabolism works at the different levels of workload, explain to them how to figure out their target heart rate (If you are worth a shit as a trainer you won't use the % of heart rate max method, you will use the VO2R or HRR method)... Explaining that a lower resting heart rate, and lower overall heart rate changes your metabolism so that you have to go off how much reserve ability you have...
Moving onto nutrition, the most important thing is not avoiding carbs or taking protein, it is learning about the different types of fats, and how they affect you, then learning about blood sugar control (even in a healthy kid it is important to start controlling cholesterol and blood sugar so they dont end up a sick adult, we aren't suppose to have to take prescritpions for metabolic shit at the young age of 60)
A good personal trainer finds out about physically active hobbies, interest that might be incorporated into the training program to keep their interest...
So, my point is, some trainers are worth $100 plus an hour, and some are only worth minimum wage... Depends on what you can contribute to your clients life.