Hi Beebo, I am 88 with a dual ascending aneurysm (4.2 & 4.5) and still go to the gym 3 - 4 times a week. It is generally accepted that an aneurysm will grow at 1/3 cm per year and that surgery is not required until 5.5cm. So when I asked my doc if I had 3 years before I go under the knife, he laughed and said I have more than that since I am in very good physical condition. If your aneurysm is stable at 4.0 after 3-4 years, you are doing something very right. The gym regimen followed by georgeh sounds pretty safe to me possibly minus the push-ups.