Which statement about the time commitment for exercise is true?

• A. People who are trying to lose weight should engage in short, high-intensity work-outs.
• B. Higher intensity workouts take less time.
• C. Every student should engage in moderate exercise for 60 minutes per day.
• D. 15 minutes a day of exercise is sufficient for meeting any fitness goal.

Answer: (B)

The main idea is that how hard you work (the intensity) can change how long you need to exercise to achieve a given fitness result. When you push at a higher intensity, you burn more calories per minute and stimulate your cardiovascular system more, so you can reach similar benefits in less overall time. That’s why taking on higher-intensity workouts can take less time to reach a goal, provided you do them safely and allow for recovery.

Think about typical guidelines: many adults benefit from about 150 minutes of moderate activity or 75 minutes of vigorous activity per week, with options to mix in shorter, higher-intensity sessions that still add up to those totals. So shorter, tougher workouts can be effective time-wise, but they’re not a universal rule for everyone or for every goal.

The other statements oversimplify or misstate realities. Weight loss depends largely on total energy balance over time, not just workout duration, so while high-intensity work can aid it, it isn’t the only path. Saying everyone should do 60 minutes of moderate activity every day isn’t a one-size-fits-all prescription, and 15 minutes a day isn’t enough to meet most fitness goals.