This document discusses physical activity, physical fitness, and their health benefits. It defines physical activity as body movement that uses energy, and lists examples like walking, gardening, and playing sports. Regular physical activity can improve bone and heart health, decrease body fat, and reduce depression symptoms. Both moderate activities like brisk walking and vigorous ones like running are recommended for health. Physical fitness refers to the body's ability to work efficiently and includes components like cardiovascular endurance, muscular strength, body composition, and flexibility. Engaging in aerobic activities can help exercise the whole body for long periods.