Extreme heat may keep millions from exercising, linked to 500,000 early deaths yearly

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A hotter world is quietly changing one of the simplest things we do for our health – moving our bodies. For many people, a walk in the park, a jog around the neighbourhood or a cycle to work is becoming harder, and sometimes unsafe, as temperatures rise.

Scientists are beginning to understand how heat affects physical activity and why this matters for long-term health. A new modelling study in The Lancet Global Health suggests that if rising temperatures lead to sustained reductions in activity...