‘The highs are extremely high – but the lows are extremely low’: when working out becomes an addiction

A t the peak of his adventuring career, Luke Tyburski was a man of extremes. The former pro-footballer, then in his early 30s, had dedicated himself to intense endurance challenges, of the sort that make a marathon look like a fun run. Beginning with the Marathon de Sables (a notorious multistage ul...

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