Purpose: The purpose of this study is to examine the impact of a combined cognitive training and aerobic exercise intervention in sedentary older adults. Recent research demonstrated that older adults who participated in aerobic fitness training significantly increased their brain volume. Equally important, the demonstrated enhancement in brain size is related to improvement on specific cognitive tasks. For example, researchers demonstrated that 124 older adults randomly assigned to receive aerobic training experienced substantial improvement in cognitive performance tasks related to speed of processing and working memory. Similarly, neuroimaging studies showed that aerobically trained individuals increased brain activation during various cognitive tasks.