Final answer:
Activities in the 6-8 METs range are considered to be of moderate intensity, as defined by the 2018 Physical Activity Guidelines.
Step-by-step explanation:
Activities in the 6-8 METs range are considered to be of moderate intensity. This classification is based on the 2018 Physical Activity Guidelines which state that during moderate physical activities, individuals can talk but cannot sing. In these activities, the body requires more energy than low-intensity activities, resulting in the use of a combination of fuel sources for ATP production, predominantly through aerobic metabolism. Those who engage in a moderate exercise program for about 1 hour per day are typically involved in this intensity range. This level of physical activity has been recognized as significantly beneficial for improving the health and weight of the nation.