As any veteran marathon runner will tell you, the opportunity to waste your good fitness on a training run is never more than a few poorly paced miles away - so we need to proceed with caution.

注入马拉松老手告诉您的，在训练中浪费您体能的只是错误配速的几英里而已- - -因此，我们必须时刻保持警惕。

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It will cripple you in your later years; you might drop dead in the middle of a marathon; and on and on. As an avid runner, I have a lot riding on whether or not these ideas about the sport are true.

跑步会使你的后半生变成残疾，你可能猝死在跑马拉松的途中等等作一为名跑步的爱好者，关于跑步这项运动的这些说法的真实性，我存在很多疑问。

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"Someone can walk up in the middle of the marathon disguised as a runner or a spectator, and we have no way of knowing, " Mr Marciani says.

BBC: Boston Marathon attack: How secure are marathons?

She had taken part in the London Marathon in 1998 as a fun runner, but in April this year she knocked an hour off her previous time, finishing three minutes inside the Olympic qualifying time as the top British woman runner.

BBC: NEWS | UK | Wales | North West Wales | Island backs runner's dream