Which of the following best represents the principle of "dose-response" in exercise?

The principle of "dose-response" in exercise refers to the relationship between the amount of exercise (the dose) and the health benefits that result from it (the response). The idea is that as the quantity of exercise increases, the health benefits also increase, up to a certain point. This reflects a direct correlation where more exercise generally leads to greater improvements in various aspects of health and fitness, such as cardiovascular health, weight management, and mental well-being.

The other options do not accurately capture the essence of the dose-response relationship. While consistent activity and flexibility in workouts are valuable, they do not directly address the specific correlation between the amount of exercise and the resulting benefits. The choice regarding intensity is misleading as intensity can significantly influence the response; higher intensity can lead to greater adaptations and benefits. Thus, option A best embodies the dose-response principle as it directly correlates increasing exercise with enhanced health outcomes.