According to the consensus of the centers for disease control and prevention, the american college of sports medicine, and the surgeon general, engaging in moderate intensity physical activity on most days of the week, is associated with a % reduction in all-cause mortality. 30-40% 10-20% 20-30% 40-50%

The answer is 30-40% mortality reduction in all cause mortality. This is done when engaged in moderate intensity of physical activity such as walking, sports, stair climbing which is done in a regular basis for at least an hour. This tells that there are benefits even in achieving only moderate intensity of physical activities. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3034999/