Increased Life Expectancy (from Exercise) Calculator View Calculator According to Dr. Ralph Paffenbarger you increase your life expectancy by 2 hours for each hour of vigorous exercise. (Recent results of a study of over 17,000 Harvard alumni started in 1962.) Enter your exercise habits to calculate how many hours you have exercised or will exercise over time and the resulting increase in your life expectancy. Learn more about putting this calculator or other calculators on your website.