More exercise is generally better than less, and more coronary artery calcium is worse than less.

“how exercise duration and intensity affect coronary calcium levels”

“about 75% of both group all three groups about 75% of them had relatively little coronary calcium and and the number we worry about a score of a 100 because that's where the the higher the calcium level above a 100 the greater the risk so that's sort of our clinical cut point where it becomes really clinically meaningful and among those individuals who have the majority so 75% of our group had coronary calcium scores less than 100 there was no difference in coronary calcium among the three different activity groups and a 50% reduction in events quite dramatic”

“you're better off having no calcium than having a lot of calcium absolutely right because calcium is a sign of atherosclerosis if you've got calcium you're better off being fit than unfit okay and in in Nina radford's paper also from the Cooper Clinic we showed that there's an interaction between calcium and fitness so the higher your Fitness the closer the high calcium group comes to those with no calcium so if you're unfit with a high calcium score that's a disaster if you're very fit with a high calcium score you're worse than if you had no calcium but not that much worse because the fitness ends up being protective”