It was explained to me that the exercising where you walk, run, bike, stair step, whatever, is slowly increased and therefore that is why after exercise your BP normally goes down. The lifting where you hold your breath, grunt or groan and have to exert, then you are done is what is not good. I was lifting a heavy item when my aorta dissected in three places. It was an emergency situation. I previously had been diagnosed with a 4cm anuerysim in the arch. It was 4.5 at the time of dissection and emergency surgery. I will be 70 this year.