Step 1: Understanding the concept of physical activity.
Physical activity involves any movement of the body that requires energy expenditure. This includes various forms of exercise, sports, and other activities that increase heart rate and burn calories.
Step 2: Analyzing the options.
- Option (A) "Basketball match" involves physical activity, but it’s a team sport rather than an individual activity, so this isn't the best example.
- Option (B) "Running a marathon" is an excellent example of physical activity because it requires continuous movement, endurance, and energy expenditure over a long distance.
- Option (C) "Watching a soccer game" is a passive activity; it doesn’t involve physical exertion or movement, so it’s not considered physical activity.
- Option (D) "Playing chess" is a mental activity that involves strategy and thinking but doesn't qualify as physical activity.
Step 3: Conclusion.
The correct answer is (B) Running a marathon, as it is a clear example of physical activity that requires continuous physical effort.
Final Answer: Running a marathon.