 - Before beginning the exercise program Group A or waiting period Group B, participants will undergo a series of tests to measure exercise capacity, fatigue level and quality of life. They will be asked to complete a series of questionnaires and meet with an exercise physiologist and undergo a treadmill test designed to measure physical fitness in patients with a chronic illness. The participant will complete the questionnaires again 8 weeks after enrolling in the protocol and will complete one final set and undergo a second treadmill test after the 16-week study period has ended. 