Which exercise is best categorized as a moderate-intensity cardiorespiratory fitness activity?

Brisk walking is categorized as a moderate-intensity cardiorespiratory fitness activity because it elevates the heart rate to a level that improves cardiovascular health without reaching the extremes of high-intensity activities. This form of exercise allows individuals to maintain a conversation while walking and is typically performed at a pace of around 3 to 4.5 miles per hour. Moderate-intensity activities are essential for enhancing cardiorespiratory fitness, promoting endurance, and burning calories effectively without overwhelming the body.

In contrast, high-intensity interval training and running a marathon involve significantly higher cardiovascular demands that push the body into a more vigorous exercise category. Powerlifting, on the other hand, focuses more on maximal strength and does not primarily target cardiorespiratory fitness, thereby making it unsuitable for this particular classification.