My cardiologist looked at my stress echocardiogram to see how my blood pressure rises as my heart rate goes up. Using that, he told me that I should be fine up to 140 beats per minute. I wear a heart monitor when I work out so that’s an easy upper limit to avoid. The exercise physiologist I met with really emphasized the need to breathe (don’t hold breath!) when lifting or straining. And to to just not lift things that cause too much strain. I asked about luggage since my bags typically weigh 50 lbs and my wife’s as much as 70 lbs. He said I could probably manage them if I really focused on technique. (Letting them fall, sliding them up, positioning my body so it’s not a strain, and breathing all the time).