What type of activity is NOT considered physical activity?

The option that indicates "Setting in a chair" is not considered physical activity is correct because physical activity is defined as any movement that involves the contraction of muscles and expends energy. This includes various forms of exercise and movement such as walking, lifting weights, and dancing, all of which require varying degrees of muscular engagement and energy expenditure. In contrast, sitting in a chair is a sedentary behavior that does not involve muscle use and does not contribute to physical exertion. Understanding this concept highlights the importance of engaging in regular physical activity for overall health and fitness, as sedentary behavior can lead to negative health consequences over time.