Running every day (each day) is good for our health, but new research says running too much (more than necessary) 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 (remove, subtract) the good things from exercise. It can also damage your heart and lead to (cause, result in) heart disease. He added (In addition he said) that the risk of long-distance runners dying from heart disease could be the same as (similar to) someone who never exercised.
Researchers looked at the health and training (exercises) of 3,300 runners. Seventy per cent of them ran over 30 kilometers 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 kilometers every week and thought his heart was “indestructible (too strong)”. Now he has heart problems. He said people should exercise regularly (often, at the same time each day) but not too much.
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