 So you should be exercising, they say, at 80% of your maximal heart rate. So 120 would be kind of the upper limits of where you would want to be at that age. You don't give me a number as to what your heart rate is, but you say it's catastrophically high. That may mean it's in the high hundreds or maybe over 200s. That's tachycardia, and that's a sign that the governor on your heart