Mild Cognitive Impairment, Buddy Supported Exercise/ My Buddy Study

The 5-month aerobic exercise intervention is in accordance with the American Heart Association and American College of Sports Medicine physical activity recommendation for optimizing cardiovascular fitness in older adults.Exercise will consist primarily of walking on the treadmill.The goal of the program will be for participants to exercise at a moderate- to high-intensity, defined as 65-80% (ACSM guidelines) of heart rate reserve (HRR), for 30 minutes, 4 days per week.The duration of exercise will progress from 15-20 mins at 50% HRR the 1st week to 30 mins at 65-80% HRR by the end of the 6th week and thereafter.At the start of each session, exercise intensity will be gradually increased to 50% HRR(0.5\[HRmax-HRrest\]+HRrest)during a 10minute warmup period,and then to the individualized target heart rate training zone for the next 25-30 minutes.Participants will wear a digital heart rate monitoring device for the duration of the training session.