Men who have trained for decades in marathons and endurance sports are more likely to have calcium deposits in their heart arteries than men who don't exercise much—even if they're otherwise healthy and have no heart disease risk factors.

Older athletes who train hard for many years tend to have more calcium deposits and fatty buildups in their heart arteries, but these buildups are usually hard and stable, not soft and dangerous.

Men who have trained for decades as elite endurance athletes, like cyclists or marathoners, tend to have more fatty deposits in their heart arteries than healthy men who exercise moderately—even when both groups are fit and have normal cholesterol and blood pressure.

Even though elite athletes have more plaque in their hearts, the type of plaque they have is harder and less likely to rupture — which might be why they live longer than you’d expect.

Men who have exercised very intensely and for many years are more likely to have calcium deposits and plaque in their heart arteries than those who exercised less, even though they tend to live longer.

Men who exercise moderately — like running a few times a week — tend to have less calcium buildup in their heart arteries than men who don’t exercise much.