Agree with everything @moonboy explained. Your question is very common in this forum, there are cardiologists in the US that specialize in aortic diseases and have done their research in exercise and its effects on aneurysms. There’s a group in Facebook dedicated to the topic, someone mentioned it in a previous post, where they share info from those cardiologists, will try to find the name. One of those experts is Dr Siddharth Prakash (UT Health in Houston) there are a couple of videos of him talking about the subject that have been posted in this forum.

Being in good physical shape will pay dividends when and if you ever need surgery. I had mine at 54 yo, it was 5.2cm and found after an MTB accident, I exercised all my life and was in great shape, my surgery went very smoothly and recovery was fast, I’m 60 now and exercise intensely. Have learned to limit weights to what I can comfortably handle while breathing through every single rep, never hold my breath (as Moonboy said), even though it is repaired I need to keep my BP in check to prevent new ones

That’s the main goal keeping you BP always in control.

I will repost the video and will look for the FB group name

Take care!