Volunteers are randomly assigned to one of three groups: 1). 8 weeks of resistance (strength) training followed by 8 weeks of bicycle exercise training, 2). 8 weeks of chair exercise followed by 8 weeks of resistance (strength) training and bicycle exercise training, or 3). 8 weeks of chair exercise followed by 8 weeks of bicycle exercise training. The length of the training is 16 weeks for all 3 groups. Volunteers train 3 days per week in our lab located in the Chicagoland area and are supervised by an exercise specialist.