Final answer:
The correct option that is NOT a benefit of being physically fit is fewer calories are burned because of an increase in muscle mass. Being physically fit has a positive impact on your metabolic rate, as well as on the strength and health of your heart and lungs.
Step-by-step explanation:
The correct option that is NOT a benefit of being physically fit is: Fewer calories are burned because of an increase in muscle mass. When you have an increase in muscle mass, it actually leads to a higher metabolic rate, which means that your body burns more calories at rest. This is because muscles are more metabolically active than fat tissue.
In addition to a higher metabolic rate, being physically fit also benefits your heart and lungs by making them stronger. Regular exercise helps to improve cardiovascular health, increase lung capacity, and enhance overall endurance.
Overall, being physically fit brings various positive effects to your body, including an increase in metabolic rate and stronger heart and lungs.
Learn more about Benefits of being physically fit