I had a complete type A1 aortic dissection starting at the root when I was 50 back in 2015. It was an absolute unmitigated disaster. If I had known what was inside my chest, I would not have pushed myself the way I was pushing myself with work, travel and stress. I don't know what my aortic size was before I dissected because it was sudden and I had absolutely no idea that I had an aneurysm inside my chest. All of that is to say that if I were you, I would eliminate any kind of planking, grunting, dead lifting, or any other kind of valsalva maneuver type exercises. Eliminate all stress. Get your blood pressure down right now and listen to your doctors. If you've got a family history of this, like I do, then you understand that you are a candidate for surgery at 5.0 cm. I would make a very specific plan with a cardiothoracic expert in aortic repairs at a major heart care center near you. I'm not going to lie: it's a tough surgery and a tough recovery, but I'm here right now 11 years later, talking to you about it. You're going to be fine but you need to avoid adding any blood pressure spikes to you heart. Walking and maybe gentle pool work. Peace.