What does the term "metabolic equivalent" (MET) refer to in exercise?

The term "metabolic equivalent" (MET) is defined as the ratio of the working metabolic rate to the resting metabolic rate. This measurement provides a standardized way to express energy expenditure relative to rest. One MET is equivalent to the energy expenditure at rest, typically defined as approximately 3.5 milliliters of oxygen consumed per kilogram of body weight per minute.

When you engage in physical activity, your body demands more energy, thus increasing your metabolic rate. By using METs, it becomes easier to compare the energy cost of various activities. For example, a physical activity with a MET value of 4 means that it requires four times the energy expenditure as being at rest. This understanding allows individuals and professionals to gauge the intensity of activities and tailor fitness plans accordingly to meet specific health and fitness goals.