The Village Interactive Training and Learning Study

The purpose of this research study is to help scientists and health care providers learn more about preventing dementia and brain disease in older adults. There is an urgent need to develop strategies to prevent or slow down memory loss and brain function decline in the elderly. In this study, the investigators hope to learn how physical exercise and a brain training program work together to improve thinking and memory in older adults. Specifically, these aims include: * Learning whether physical activities (like biking or treadmill walking or Wii Fit games) will help improve the benefits of a brain training program. Based on preliminary results and that in the literature, the investigators anticipate greater cognitive benefits in the Exercise + Cognitive training groups than the Cognitive Training alone group. * To determine whether the benefits of adding exercise will occur quickly or develop more gradually over time. The investigators suspect that a major benefit of exercise pre-dosing will occur by the 12th week of the program. * To examine whether Wii-Fit exercise games cause similar effects on brain training as traditional exercise programs such as biking or walking. Although several recent studies have raised questions about the true aerobic benefit of exergames such as Wii-Fit Plus, other evidence suggests that these weaker aerobic benefits may be offset by the greater novelty and interest level afforded by exergames.