Many of our top Olympic athletes are undergoing brutal training sessions inside a sweltering heat chamber to prepare for next year's Games in Tokyo.

It's part of a wide ranging strategy that High Performance Sport New Zealand hope will help combat the extreme weather conditions expected, and ultimately provide a winning edge.

Competitors at the 2020 Games are likely to face the hottest conditions in the event's history.

Summer temperatures in the Japanese capital can reach 38C and are exacerbated by high humidity levels.

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Teams at the Rugby World Cup have struggled in the hot, sticky conditions, with the All

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