Just twenty minutes of daily exercise appears to lower your risk of cardiovascular disease in your seventies. In a recent study published in the journal Heart, Italian researchers collected data from almost 2,800 people aged 65 or older for over 20 years. They observed that people who got between 20 and 40 minutes a day of moderate-intensity activity, like brisk walking, or vigorous-intensity activity, like jogging or biking, had a lower risk of cardiovascular disease, heart attacks, and premature death, compared with people who weren’t physically active. For men, only twenty minutes of daily exercise was needed to cut the risk of cardiovascular disease in half.