Final answer:
A positive example of a health and fitness advertisement promotes exercise and healthy eating, while a negative example promotes extreme dieting and unrealistic body standards.
Step-by-step explanation:
One positive example of a health and fitness advertisement can be found on a website promoting a fitness program. The ad features a before and after photo of a person who has transformed their body through the program, along with testimonials from satisfied customers. The ad emphasizes the positive benefits of exercise and healthy eating.
A negative example of a health and fitness advertisement can be found on a website promoting extreme dieting and weight loss. The ad uses excessive language and unrealistic body standards to promote their product, which can contribute to unhealthy behaviors and body image issues.