Some exercise is undoubtedly better than none, but if people go beyond moderate amount, it can cause problems.
Many people who seem physically fit report collapses in a match, race or during workouts. Bolton Wanderers' Fabrice Muaumba, for example, nearly died of a cardiac arrest while playing. Meanwhile, BBC TV presenter and journalist Andrew Marr has blamed his stroke on overwork and intense rowing machine sessions.
The most recent case of collapse was a 23-year-old man who collapsed and died while running in the Brighton marathon on April 14. He is thought to have had a cardiac arrest.
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