Just found this forum today, have read posts in the past about thoracic aortic aneurysms but they are very old. I am 37 and have a 4.3 aneurysm at the root of my aorta. Also, have a right to left shunt and just recently had an ablation for A-Fib. I'm 6'1" 170lbs and like to run, but am scared to... I'v seen several different doctors and some say to run and some say not too... this is frustrating, feels good to run, but get paranoid.. I used to lift weights to stay strong because of back issues, but with the aneurysm I have stopped, and now the back pain is worse than ever... Need to exercise more to stay healthy and ease the anxiety, but don't know... life is miserable!!