Exercise: How much do I need every day? - Mayo Clinic

For healthy adults younger than age 65, the American Heart Association and the American College of Sports Medicine recommend at least 30 minutes of moderate-intensity aerobic activity (think brisk walking or swimming) five days a week or at least 20 minutes of vigorous aerobic activity (such as running) three days a week, plus strength training exercises twice a week.

If you want to lose weight or meet specific fitness goals, you may need to increase your activity even more. Remember, the more active you are, the greater the benefits.