@penaltybox24. just to add to the good comments made by others. I was diagnosed AAA in June of 2021 at 4cm. Now 4.5 cm, stable for the last 1-1/2 year. My suggestion is to get in touch and get evaluated by a cardio thoracic specialist/surgeon who deals with this condition a lot. They know how to read the scans and give good advice and also good to have them lined up if surgery is needed. In my case they told me not to bring my heart rate above 125 BPM and stop any strenuous exercise (I was road cycling in mountainous terrain and was told to stop). Lifting heavy items is also a no. In my case there is a lot of variance in readings depending on radiologist or cardiologist, so i rely on the readings done by the Thoracic Surgeon who does his own readings from the scan. He has told me that surgery is recommended at 5.0 or higher. I am still on annual scans.