The investigators will quantify cognitive improvements following moderate to high intensity aerobic exercise intervention (participant will choose between treadmill, elliptical or stationary bike). Each participant will engage in 60 minute daily sessions delivered 3 times/week for 8 consecutive weeks (a total of 24 sessions). The investigators will determine the relationship between cognitive improvements and TMS neuroplasticity. The cognitive domains explored will be: 1) Visuomotor processing speed and cognitive flexibility/task switching; 2) Response inhibition, mental flexibility, and attentional control; 3) Attention and working memory; 4) List Learning and Memory; and 5) Semantic Verbal Fluency. The investigators will also explore the effect modification of BDNF levels and BDNF allelic status, and APOE4 status on cognitive response after exercise.
The overall goal of the proposed study is to evaluate the effects of an 8-week aerobic exercise program on cognition and determine the relationship between cognitive improvements and Transcranial Magnetic Stimulation (TMS) neuroplasticity. The investigators will also explore the effect modification of BDNF levels and BDNF allelic status, and APOE4 status on cognitive response after exercise.