Final answer:
The intensity of lifetime/lifestyle general physical activity recommended by FITT principle and the 2018 Physical Activity Guidelines can be low, moderate, or high, depending on individual goals and health status.
Step-by-step explanation:
According to the FITT principle and the 2018 Physical Activity Guidelines for Americans, the intensity of lifetime/lifestyle general physical activity can be low, moderate, or high. The guidelines communicate the importance of varying levels of physical activity to improve health and increase life expectancy. Low intensity or skill-based activities, like gentle stretching, can be appropriate for some individuals or situations. Moderate-intensity activities are those where you can talk but not sing and may include brisk walking or light cycling, typically recommended for about 1 hour per day. High-intensity activities are more challenging, such as running or aerobic dancing, where speaking more than a few words without pausing for breath is quite difficult, usually ranging from 1 to 3 hours per day. The precise intensity level recommended for individuals will vary based on personal health status, fitness goals, and other factors.