The Archives of Internal Medicine conducted a long-term study on exercise and found that working out has clear and concrete positive effects on lifespan. People who exercise about five times a week live five years longer than those who do nothing, for example. Just walking 30 minutes a day adds an extra year and a half to your life. But vigorous exercise will get you 4 more years. Even if you’re 35 or 45 and you’ve never worked out, you can start now and still add years, results show. It’s never too late to improve your health.