Final answer:
A good fitness rating reflects the level of fitness one may need to live a fully healthy life. The HHS recommends regular aerobic activity, and adhering to these guidelines has been associated with numerous health benefits and increased life expectancy.
Step-by-step explanation:
If you achieve a good fitness rating, you're probably at the level of fitness you need in order to live a full, healthy life. The concept of fitness here relates to one's relative fitness, reflecting an individual's ability to survive and reproduce in comparison to the rest of the population. The U.S. Department of Health and Human Services (HHS) guidelines suggest adults should engage in aerobic physical activity for 2.5 hours at moderate intensity or 1.25 hours at vigorous intensity each week, and maintaining or exceeding these guidelines has been correlated with significant health benefits.
Regular physical activity can result in a gain of life expectancy, improved immunity, and better overall mental and physical health. Achieving good fitness levels requires a lifestyle that is consistent with the biological health needs of humans, which includes maintaining a healthy diet, getting plenty of physical exercise, and ensuring the experience of social interactions, otherwise known as conviviality.