Question

how can teens demonstrate good physical fitness to their families?
by keeping their rooms tidy
by flossing their teeth every day
by saying please and thank you
by taking the stairs instead of the elevator

Explanation:

• Keeping rooms tidy relates to organization, not physical fitness.
• Flossing teeth is oral hygiene, not physical fitness.
• Saying "please" and "thank you" is about manners, not physical fitness.
• Taking stairs instead of elevator is a physical activity that contributes to physical fitness.

Answer:

by taking the stairs instead of the elevator