As global temperatures rise and humidity levels soar, endurance athletes are increasingly pushed to their limits.
From marathoners to triathletes, training in such extreme conditions has become a test of both physical and mental resilience.
Some of the most humid conditions in the world can be found in Asia, presenting a different set of challenges to athletes who live in these countries.
Beyond just climate, pollution levels also pose a threat to those training outside.
But training in these extreme environments can also give athletes a competitive edge, as long as they prepare and adapt properly.