The heat is on as Tokyo faces extreme temperatures during test events a year out from the 2020 Olympic Games.

Olympic test events are supposed to be just that — a litmus test for Olympic hopefuls, the host city, and the international sports federations responsible for the competitions.

This summer's events in Tokyo have mostly been a test of how to manage the heat. On Thursday, the women's triathlon was shortened because of dangerous temperatures.

Tokyo officials had already added extra water stations and positioned medical personnel every 500 metres on the run course, added more air-conditioned areas for athletes

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