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Not intended to support the parent's assertions, but it has been established that endurance exercise increases the propensity for Atrial Fibrillation, a potentially dangerous arrhythmia of the heart. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2638655/.

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Sure, but it also decreases mortality by reducing the risk for hundreds of diseases, including heart disease, the leading killer for over-65s. You have to balance pros/cons, obviously!

The point under discussion was the effect of endurance exercise, not exercise generally.

"It"? In addition to a specific type of exercise, we're talking about a continuous variable here. Are you so sure it's a linear relationship, with the heaviest exercisers experiencing the greatest benefits? Because that seems like a tenuous position.

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