Final answer:
Physical activity contributes significantly to daily total energy expenditure, and the recommended guidelines suggest aiming for at least 150 minutes to 300 minutes per week of moderate-intensity aerobic activity.
Step-by-step explanation:
The amount of daily total energy expenditure that physical activity counts for is dependent on a variety of factors such as age, weight, and the intensity and duration of the activity.
According to the 2018 Physical Activity Guidelines for Americans, adults should aim for at least 150 minutes to 300 minutes per week of moderate-intensity aerobic activity, or 75 minutes to 150 minutes per week of vigorous-intensity aerobic activity, or a combination of both.
While it is difficult to provide an exact percentage of how much physical activity contributes to daily total energy expenditure without specific information about an individual, it is safe to say that physical activity plays a significant role in overall energy expenditure.