Extreme heat has changed elite sport this summer – it must adapt to survive | Sport

The mercury-shattering European summer pants alongside us on the back straight, looming as we hug the shadows, sweaty sandals on the parched earth. Across Asia, Africa and North America too, inhabitants have endured the warmest July of their lives.

In Toronto, Alex Hutchinson, author of the bestseller Endure: Mind, Body, and the Curiously Elastic Limits of Human Performance, has just come back…