Aerobic exercise: The aerobic exercise program will include walking on a treadmill (15-20 minutes), and stationary cycling (25-30 minutes), followed by cool-down stretching afterwards (5 minutes). The aerobic exercise program will also take place three times per week for around 45-55 minutes at each session. The heart rate will be continuously monitored during exercise by a portable recorder aiming to maintain the heart rate in the range of 50-60% of the maximum VO2 value, yielding an exercise exertion level which is considered as a moderate intensity. The aerobic training session will be operated with a size of no more than 10 participants.