The 400m record that stood for forty years is on watch
Two runners have gone under 43.5 this season. The track, the shoes and the schedule all say why.


Sport science correspondent
ParisAt SportPulse since 2018French · English
Features and long reads. Sport science — shoes, sleep and the one percents that decide a season — and the people the numbers are about.
Nine months in the safe-standing sections for The last terrace; a season with a kit factory before that.

Two runners have gone under 43.5 this season. The track, the shoes and the schedule all say why.

The balls changed in March. The tour has been arguing about it since.

Twenty-five clubs, one pilot licence and a generation of fans who never stood at a match. Nine months in the safe-standing sections — and…

A green line on the kerb has changed how the last ten kilometres are run.

The bell lap of the fastest 1500m by a teenager this century, with the splits.

Carbon, resin and a rulebook that has not caught up: inside the pole that added ten centimetres.

Red cells, sleep and the two weeks after coming down, measured on twelve distance runners.

Twenty-five clubs, one pilot licence and a generation of fans who never stood at a match. Filmed across nine months in the safe-standing sections.

The tapes are decaying, the rights are contested, and nobody is paid to care.

The tour asks for eleven months of a body that was built for eight.
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