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Health

Can running too far be bad for your health?

There’s no doubt that doing some long-distance running improves our fitness, but at what point does it become too much, asks Grace Wade

By Grace Wade

30 April 2025

A runner near mile marker 20.2 in the Bronx grimaces in pain as he competes during the 2017 TCS New York City Marathon in New York on November 5, 2017. Five days after the worst attack on New York since September 11, 2001, the city is staging a show of defiance on November 5, as 50,000??runners from around the world are set to participate in the New York Marathon, under heavy security. (Photo by Don EMMERT / AFP) (Photo by DON EMMERT/AFP via Getty Images)

Is there an upside – or downside – to longer races?

Don Emmert/AFP via Getty Images

Ever since I announced in my previous column that I am training for a half marathon, friends keep asking me whether a full marathon is up next. My answer is always the same – no way. While running 21 kilometres seems a manageable challenge, running 42 just feels self-punitive. But all of this inquiring has me wondering whether there is an upside – or downside – to longer races.

Research in this area is scant, but a few studies do indicate declining returns, and even some evidence of harm.…

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