What are some of the benefits of exercise mentioned in relation to lifespan?

The choice highlighting better energy levels and stronger bones is the correct answer, as it encompasses significant benefits of exercise that contribute positively to overall health and can influence lifespan. Regular physical activity is known to enhance energy by improving cardiovascular efficiency and increasing endurance, allowing individuals to perform daily tasks with less fatigue.

Additionally, exercise plays a crucial role in bone health; weight-bearing activities stimulate bone density, which is particularly important in preventing osteoporosis and fractures as one ages. Stronger bones contribute to mobility and independence, essential components for a longer, healthier life.

While factors like mood enhancement can be beneficial, the combined advantages of improved energy and stronger bones specifically link exercise to an increased quality of life and longevity. Other options do not present health or exercise benefits that contribute positively to lifespan. For example, increased resting heart rate and weight gain can lead to health issues rather than benefits, and a focus on appetite alone disregards the overall impact of exercise on physical and mental health.