Metabolic Equivalents (METs)
When the energy cost of a given task is expressed in METs, or metabolic equivalents, it is shown as a ratio to resting energy expenditure. This is a useful tactic in exercise prescription, since the energy expenditure required of a large and heavy individual is increased in proportion to their resting metabolism, which in turn reflects their large size. One MET is equal to 3.5 ml of O2 per kg of body weight per minute, or 1 kcal per kg of body weight per hour. Any activity above resting requires greater oxygen consumption, and therefore, yields a higher MET level.