Final answer:
Sustained physical activities like running, walking, and cycling improve cardiorespiratory fitness by engaging large muscle groups and increasing heart rate and breathing.
Explanation:
Cardiorespiratory fitness is best improved with sustained physical activities like running, walking, and cycling because these activities involve continuous rhythmic movements of large muscle groups, which increase heart rate and breathing. Regular aerobic exercise not only strengthens the heart and lungs but also enhances the body's ability to deliver oxygen efficiently to cells, reducing cardiovascular disease risk.
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