People who exercise very hard a lot have way more clogged arteries than those who exercise less, but only if you measure their effort with devices, not just asking them.
Evidence from Studies
Supporting (3)
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Lifelong endurance exercise and its relation with coronary atherosclerosis
People who trained intensely in endurance sports like running or cycling their whole lives had more plaque in their heart arteries than similar people who didn’t exercise that much—even though they were all healthy. This was found using detailed scans, not just asking them how much they exercised.
This study found that athletes who trained a lot over many years—especially with intense workouts—had more plaque in their heart arteries, but only when their training was measured by wearables, not by what they remembered. So yes, long, hard exercise can increase heart plaque, and self-reports miss this.
Coronary atherosclerotic burden in veteran athletes: The relationship between cardiovascular risk and volume of exercise.
The study found that super-active athletes don’t necessarily get more heart plaque unless they also have other health risks like high blood pressure or cholesterol — so exercise alone isn’t the culprit, contrary to what the claim suggests.
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