Questions: Select the correct answer. What is the definition of physical activity? A. a movement that stimulates your respiratory system B. a movement that causes perspiration C. a movement that results in the body's use of energy D. a movement that requires little effort

The answer is the third one (C): a movement that results in the body's use of energy.

Explanation for each option: A. A movement that stimulates your respiratory system - This is not entirely accurate as physical activity involves more than just stimulating the respiratory system; it encompasses any movement that uses energy. B. A movement that causes perspiration - While physical activity can cause perspiration, not all physical activities necessarily lead to sweating. Therefore, this definition is too narrow. C. A movement that results in the body's use of energy - This is the most accurate definition. Physical activity is any movement that requires energy expenditure, which includes a wide range of activities from walking to intense exercise. D. A movement that requires little effort - This is incorrect because physical activity can vary in intensity and does not necessarily require little effort.

Summary: The correct definition of physical activity is a movement that results in the body's use of energy.