Exercise and physical therapy are commonly touted as keys to preventing an array of conditions: heart attack, depression, cancer and more. But how does the exercise equation change once a patient is diagnosed with an illness? How does a patient's perspective on their disease impact their outlook on exercise? Dr. Marilyn Moffat, professor of physical therapy at New York University and an internationally-respected voice in physical therapy, provides her perspective on the value of exercise in encouraging patients stricken with illness to work beyond the boundary of what they initially believed they could accomplish. Dr. Mark Nolan Hill hosts.