Does working out make pectus excavatum worse or better?

Pectus excavatum. Pectus excavatum can be surgically repaired, but surgery is usually reserved for people who have moderate to severe signs and symptoms. People who have mild signs and symptoms may be helped by physical therapy. Certain exercises can improve posture and increase the degree to which the chest can expand.
Neither. Working out isn't going to make it better or worse. It a congenital problem that usually doesn't cause problems.