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We all know that running a few kilometres each day is good atforfromofoverup our health, right? Well, what we didn't know, until now, is that running too much could be bad atforfromofoverup us. New research suggests that running long distances regularly atforfromofoverup many years could shorten our life instead atforfromofoverup extending it. The study is atforfromofoverup the Minneapolis Heart Institute Foundation. Researcher Dr James O'Keefe said too much running can cause plaque to build atforfromofoverup inside your heart. This can lead to heart disease. He wrote: "Years atforfromofoverup extreme exercise…appears to erase some benefits you get atforfromofoverup moderate exercise, so that your risk atforfromofoverup heart disease, atforfromofoverup dying atforfromofoverup coronary disease, is the same as [an inactive] person."

The researchers looked atforfromofoverup the health and training atforfromofoverup 3,300 runners atforfromofoverup the age of 35. Seventy per cent atforfromofoverup them ran more than 30 kilometres a week. The study found that men who were marathon runners atforfromofoverup 25 years had 62 per cent more plaque in their heart than men atforfromofoverup the same age who did little or no exercise. Another doctor and long-time runner, John Hagan, said he feels cheated. He has been running marathons and doing triathlons since 1967. He used to run atforfromofoverup to 60 kilometres per week. He said: "As a physician and a runner, I felt betrayed. I thought I was out there exhausting myself, building an absolutely indestructible heart." Dr Hagan advised people to exercise regularly but not to overdo things.