A workout at approximately 4 METs would be classified as which intensity?

• A. Moderate
• B. Light
• C. Vigorous
• D. Very vigorous

Answer: (A)

METs measure how much energy an activity costs relative to resting. One MET is the energy you use at rest. Moderate intensity generally falls in the range of about 3 to 6 METs, so an activity around 4 METs is right in the middle of that band. That means you’re working harder than light activities (which are typically under 3 METs) but not yet at vigorous effort (usually defined as 6 METs or more). Examples around 4 METs include brisk walking at a steady pace, casual cycling on level ground, or water aerobics. So 4 METs best describes moderate-intensity effort.