There are many studies that point to the positive effects of exercise among older adults. These results add to a growing body of evidence that suggests physical activity can lower the risk of heart disease. The key point this research makes is that you can turn back the clock of aging in your brain by adopting a regular exercise regimen- just 40 minutes, three times per week. The article also has a link to a workout plan designed by a physical trainer and exercise scientist if you need some idea what to do.