Final answer:
A significant percentage of U.S. deaths can be attributed to lack of exercise and poor fitness, though the exact figure is not specified. Regular physical activity is known to increase life expectancy and improve health. Obesity, often related to sedentary lifestyles, affects a substantial portion of the U.S. adult population.
Step-by-step explanation:
It is estimated that a significant percentage of all deaths in the U.S. are attributed to lack of regular exercise and poor fitness levels. While the exact percentage is not provided in the given resources, numerous health studies support the finding that regular physical activity is associated with a reduction in mortality rates and an increase in life expectancy.
According to the U.S. Department of Health and Human Services, adults who engage in regular aerobic physical activity gain on average 1.5 to almost 4 years of life, depending on the volume of exercise. Furthermore, obesity, which is linked to a sedentary lifestyle and poor fitness, has reached epidemic proportions in the U.S., with nearly 36 percent of adults over 20 years old being obese.
Therefore, a lack of exercise and poor fitness levels do contribute significantly to morbidity and mortality statistics in the U.S.