Running a few kilometers each day is good     1     our health. However, new research says running too much could be bad for us. Running long distances     2    (regular) for many years could make our life     3    (short) , not longer. A researcher said too much running can create plague(斑)inside your heart,    4    can lead to heart disease. He wrote that running too much for many years takes away the good things from exercise. He     5    (add) that the risk of heart disease could be     6    same as someone who never exercised.

Researchers said men who ran marathons for 25 years had 62% more plaque in their heart than men who did little     7    no exercise. Another doctor said he felt cheated. He started running marathons in 1967. He used     8    (run) 60 kilometers every week. He said, “I thought I was out there exhausting     9    (me), building an absolutely strong heart.” The doctor advised     10    (exercise) frequently but not to overdo things.