A landmark study has confirmed what many neurologists have long believed: Exercise is good for the brain. Researchers analyzed data from more than 150 studies on how physical activity affects the risk for Alzheimer’s. They concluded beyond a doubt that older people who exercise regularly have a significantly lower risk of developing the progressive brain disorder than those who are inactive. The study also found that people with Alzheimer’s who keep physically active are better able to perform routine daily activities than those who are sedentary, MedicalDaily.com reports. “After evaluating all the research available,” says study author Kathleen Martin Ginis, a professor at the University of British Columbia, “our panel agrees that physical activity is a practical, economical, and accessible intervention for both the prevention and management of Alzheimer’s disease and other dementia’s.” The study’s authors recommend that older people adhere to current federal guidelines: at least 150 minutes of moderate-intensity aerobic activity each week and muscle-building strength training at least twice a week.