Which activity is NOT classified as a moderate-intensity activity?

Bicycling at 15 mph is classified as a vigorous-intensity activity rather than moderate intensity. Moderate-intensity activities are typically those that elevate your heart rate to a level where you can still talk but may not be able to sing. Generally, moderate intensity is associated with activities that fall within the 5-7 METs (Metabolic Equivalent of Task) range.

In contrast, a biking pace of 15 mph is considered vigorous because it generally requires more effort, often leading to a heart rate that exceeds the moderate intensity threshold. For comparison, walking briskly for 30 minutes and washing windows for an hour typically fall into the moderate intensity category due to their moderate heart rate elevation. Running for 15 minutes, depending on the pace, is generally much more strenuous, often landing in the vigorous intensity range as well.