Dr Mark Porter finds out about 'singing for lung health', an evidence based therapy for helping people with breathlessness arising from conditions like Chronic Obstructive Pulmonary Disease. He hears from the choir based at Charing Cross Hospital in London and talks to respiratory physiologist, Adam Lound, to find out how the breathing and singing techniques being taught there, as well as the camaraderie, improve people's quality of life and confidence. Does exercise increase the risk of worsening an aortic aneurysm? Consultant vascular surgeon, Rachel Bell talks about the benefits of cardio vascular exercise for people with aneurysms. Dr Margaret McCartney reviews the evidence on sunscreens. Also in the programme, Saiju Jacob discusses myasthenia gravis, an auto-immune condition that causes muscle weakening. He explains what causes it and how it's treated.