Final answer:
The primary audience for the campaign to encourage teens to exercise would be teenagers in general. The advertising director could shape the writing and connect with this audience by focusing on aspects of their lifestyle that teens can relate to, such as the desire to fit in, look attractive, and improve their physical performance in sports or other activities. Some effective slogans could include 'Get Fit, Be Cool!', 'Unleash Your Inner Athlete!', and 'Join the Movement, Get Active!'.
Step-by-step explanation:
The primary audience for the campaign to encourage teens to exercise would be teenagers in general. To shape the writing and connect with this audience, the advertising director could focus on aspects of their lifestyle that teens can relate to, such as the desire to fit in, look attractive, and improve their physical performance in sports or other activities. Some slogans that could be effective include: 'Get Fit, Be Cool!', 'Unleash Your Inner Athlete!', and 'Join the Movement, Get Active!'. These slogans appeal to teenagers' desire for social acceptance, self-improvement, and excitement. Secondary audiences to consider may include parents, teachers, and community leaders who have influence over teenagers' exercise habits.