@ewei6911 hi, look for several videos that have been posted in this forum regarding the subject. The problem with strength exercises (including crunches, planks, weight lifts, etc) is that depending on weight and level of effort most people tend to hold their breath while doing them, it is a natural reaction trying to maintain core stability. It is well known that during those moments BP rises significantly, it peaks really high and drops again immediately after the rep is completed. Those peaks in BP can be very dangerous for someone with vascular issues, especially aneurysms. Cardio exercises normally mainly raise your HR, so reasonable cardio is not only ok but recommended as you want to have your body in the best shape possible.

My aneurysm was repaired 6 years ago and I have gone back for full intensity workouts but have lowered my weights and also spent time learning how to properly breathe throughout every single rep, my mind is on my breathing discipline and even for moments I forget or get distracted and I find myself holding my breath unintentionally.

If you cannot find the videos let me know and I will send them to you