Which of the following activities can improve physical fitness?

Regular aerobic exercise is a key activity for improving physical fitness because it enhances cardiovascular endurance, strengthens the heart, and increases overall stamina. Aerobic exercises, such as running, swimming, cycling, or brisk walking, elevate the heart rate and facilitate better oxygen delivery throughout the body. This type of sustained, rhythmic activity promotes better blood circulation, helps in maintaining a healthy weight, and can lead to reduced risks of chronic diseases like heart disease and diabetes.

In contrast, long periods of inactivity can lead to deconditioning and various health issues, while daily chores without breaks may not provide the same structured benefits as a dedicated aerobic exercise routine. Although lifting weights can contribute to strength and muscle endurance, it does not encompass the comprehensive benefits of aerobic fitness, such as improved cardiovascular health, which is critical for overall fitness. Therefore, regular aerobic exercise is highlighted as the most effective choice for enhancing physical fitness.