Question

1. what is the difference between physical activity and exercise?

exercise is more specific. it is physical activity that typically is planned.
exercise is needed for physical fitness; physical activity is not.
nothing - the two terms mean exactly the same thing.
physical activity is a type of exercise performed only in a structured setting.

Explanation:

Physical activity encompasses all body - moving activities. Exercise is a subset of physical activity. It is more specific, usually planned (like a scheduled workout at the gym), and often has a goal (e.g., improving strength or endurance). Physical activity can be non - planned (such as walking to the store). Also, physical activity is needed for physical fitness (e.g., daily movement like taking the stairs instead of the elevator contributes to fitness). The two terms are not the same, and exercise is not the broader category (physical activity is broader).

Answer:

Exercise is more specific. It is physical activity that typically is planned.