Final answer:
Cardiorespiratory fitness can best be achieved by an exercise program based in aerobic activities such as walking or biking.
Step-by-step explanation:
Cardiorespiratory fitness can best be achieved by an exercise program based in aerobic activities such as walking or biking. Aerobic exercise, also known as cardio, relies on the aerobic energy-generating process, which requires oxygen to meet energy demands during exercise. Examples of aerobic exercise include running, swimming, cycling, and walking. These exercises help improve cardiovascular health and increase muscular endurance. Cardiorespiratory fitness, also known as aerobic fitness, is best achieved through activities that engage large muscle groups over an extended period, increasing heart rate and breathing. Options A, B, C, and E focus on nutrition or non-aerobic exercises, which may contribute to overall health but are not specifically designed to improve cardiorespiratory fitness. Aerobic activities like walking, biking, running, and swimming are effective for enhancing cardiovascular and respiratory function, promoting endurance, and improving overall cardiorespiratory fitness.