Your personal trainer should have the following credentials and have the ability to do the following tasks:
In Australia, they should be qualified (minimum Certificate IV in PT) and registered by Fitness Australia
They should have some good life experience to understand your individual circumstances.
They should provide you with an overall exercise program to be done when they are not around.
They should review your diet and provide practical suggestions to improve your diet to help you achieve your goals.
They should tailor the training sessions and make them interesting and challenging so that every time you train you feel the benefits of the workout. It is not one size fits all!
If you would like a trainer who can do all of this for you and you live in Melbourne, please look up www.gopersonaltraining.com.au