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Running is good for our health. New research says too much is bad for us. It could make our life shorter, not longer. A researcher said too much running can damage your heart. Runners can get heart disease. Long-distance runners and people who never exercise might have the same risk of heart disease.
Researchers looked at the health of 3,300 runners. Most of them ran over 30 kilometres a week. Marathon runners had hard parts in their heart. A doctor who started running in 1967 is sad. He ran 60 kilometres every week. He thought his heart was strong. Now he has heart problems. He said we should exercise, but not too much.
Back to the long-distance-running lesson.
