Personal Trainers
When hiring a personal trainer, always ask about his or her experience, typical clients, references, and professional credentials. Trainers can be a great source of information and motivation if they are well-qualified. Look for one with a degree in a health and fitness field, such as physical education or exercise science, and certification from a national organization such as the American College of Sports Medicine or the American Council on Exercise.
Source: HOPE Health Letter, July 2006