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Exercising daily for a fitter you? Hidden heart problems that can surface when endurance exercise pushes you too hard

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Running a marathon, cycling for hours or finishing a triathlon can look like the picture of perfect heart health. Regular exercise is strongly linked with better cardiovascular health. But extreme endurance training is a different story. For some people, especially those with an undiagnosed heart problem, prolonged high-intensity exercise can expose a hidden weakness in…