There just are not many people doing enough exercise to be physically fit. Physical activity helps to increase metabolism as well as burn calories. Keeping physically active also helps to reduce one's appetite. Time, weight, and pace are three variables to consider when doing physical activity. The amount of time spent on the activity affects the number of calories burned.
Weight determines how much energy is needed to be active.
The higher a person's weight, the more energy needed. The pace at which a person works definitely affects the amount of calories burned. The faster one walks, runs, rides, etc., the higher number of calories burned. The American College for Sports Medicine recommends taking part in physical activity at least three times a week. One's maximum heart rate is calculated by subtracting one's age from 220 beats per minute.