How to exercise in the summer without heat exhaustion

With a kilometer to go, triathlete Sarah True was pulled from the 2019 Ironman European Championship in Frankfurt, Germany, due to heat exhaustion. She was in the lead by seven minutes after having swum, biked and run nearly 225 kilometres. The temperature was 38C.

source https://www.lifetechnology.com/blogs/life-technology-news-blog/how-to-exercise-in-the-summer-without-heat-exhaustion