Ultramarathons: Are women faster than men?

As running races get longer, the gap between male and female competitors seems to close. Tim Harford and Lucy Proctor investigate the claim that when the race is 195 miles long, women overtake men to become the fastest runners. Presenter: Tim Harford Reporter: Lucy Proctor Producers: Nathan Gower and Debbie Richford Production Co-ordinator: Katie Morrison Series Producer: Tom Colls Sound Mix: Neil Churchill Editor: Richard Vadon

(Image:Male and female running together up a mountain trail. Credit: nattrass via Getty)