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Running every day is good for our health, but new research says running too much could be bad for us. Running long distances for many years could make our life shorter, not longer. A researcher said too much running could take away the good things from exercise. It can also damage your heart and lead to heart disease. He added that the risk of long-distance runners dying from heart disease could be the same as someone who never exercised.
Researchers looked at the health and training of 3,300 runners. Seventy per cent of them ran over 30 kilometres a week. Men who ran marathons for 25 years had hard parts in their heart. A doctor who started running marathons in 1967 is sad. He ran 60 kilometres every week and thought his heart was "indestructible". Now he has heart problems. He said people should exercise regularly but not too much.
Back to the long-distance-running lesson.
