Even though endurance athletes and healthy non-athletes have about the same amount of calcium in their heart arteries, the athletes’ calcium levels are higher than 90% of people their age, suggesting their arteries are aging faster from exercise.

Even though endurance athletes have less dangerous soft plaque, their amount of hard, calcified plaque in the heart arteries is about the same as in people who don’t exercise.

If an athlete has a high calcium score on a heart scan (over 100), doctors should treat them like someone with early heart disease — lower their bad cholesterol and test how their heart handles exercise.

Even if someone is a super-athlete, having calcium buildup in their heart arteries still means they’re at higher risk for a heart attack—exercise doesn’t cancel out this danger.

Even if you’re super fit and exercise a lot, having calcium buildup in your heart arteries still means you’re at higher risk for a heart attack or needing a stent.

If you have calcium in your heart arteries, you’re at higher risk for a heart attack—even if you’re a marathon runner. Exercise doesn’t make that calcium harmless.